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Groups > sci.electronics.design > #695455 > unrolled thread
| Started by | Bob F <bobnospam@gmail.com> |
|---|---|
| First post | 2023-05-10 13:31 -0700 |
| Last post | 2023-07-25 04:01 +0100 |
| Articles | 20 on this page of 81 — 20 participants |
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Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-10 13:31 -0700
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-10 23:04 +0200
Re: Why do circuit breakers go up for on and down for off? SteveW <steve@walker-family.me.uk> - 2023-05-10 23:07 +0100
Re: Why do circuit breakers go up for on and down for off? Fredxx <fredxx@spam.uk> - 2023-05-11 01:19 +0100
Re: Why do circuit breakers go up for on and down for off? Tim W <nospam@example.com> - 2023-05-11 09:31 +0000
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-11 14:19 +0200
Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-11 06:48 -0700
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-22 13:46 +0200
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-05-22 12:58 +0100
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-22 23:16 +0200
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-23 02:49 +0000
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-23 11:10 +0200
Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-22 08:56 -0700
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-22 23:21 +0200
Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-22 17:58 -0700
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-23 13:13 +0200
Re: Why do circuit breakers go up for on and down for off? Paul <nospam@needed.invalid> - 2023-05-22 14:10 -0400
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-22 23:35 +0200
Re: Why do circuit breakers go up for on and down for off? Bob F <bobnospam@gmail.com> - 2023-05-10 19:09 -0700
Re: Why do circuit breakers go up for on and down for off? Jasen Betts <usenet@revmaps.no-ip.org> - 2023-05-12 13:49 +0000
Re: Why do circuit breakers go up for on and down for off? Paul <nospam@needed.invalid> - 2023-05-12 20:40 -0400
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 01:34 +0000
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 09:26 +0200
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-13 07:25 -0700
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 19:08 +0000
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-13 12:39 -0700
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 02:49 +0000
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 09:47 +0200
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 06:48 -0700
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 18:12 +0000
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 11:45 -0700
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-14 21:38 +0000
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 23:45 +0200
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-05-14 14:54 -0700
Re: Why do circuit breakers go up for on and down for off? "Rod Speed" <rod.speed.aaa@gmail.com> - 2023-05-15 11:50 +1000
Re: Lonely Obnoxious Cantankerous Auto-contradicting Senile Ozzie Troll Alert! Peeler <trolltrap@valid.invalid> - 2023-05-15 10:10 +0200
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-14 21:03 +0200
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 23:39 +0200
Re: Why do circuit breakers go up for on and down for off? "Carlos E.R." <robin_listas@es.invalid> - 2023-05-13 03:53 +0200
Re: Why do circuit breakers go up for on and down for off? Paul <nospam@needed.invalid> - 2023-05-13 03:31 -0400
Re: Why do circuit breakers go up for on and down for off? rbowman <bowman@montana.com> - 2023-05-13 21:14 +0000
Re: lowbrowwoman, the Endlessly Driveling Senile Gossip Peeler <trolltrap@valid.invalid> - 2023-05-13 23:41 +0200
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-06-23 06:16 +0100
Re: Why do circuit breakers go up for on and down for off? Jasen Betts <usenet@revmaps.no-ip.org> - 2023-05-17 12:16 +0000
Re: Why do circuit breakers go up for on and down for off? Sam Plusnet <not@home.com> - 2023-05-13 20:25 +0100
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-06-21 04:00 +0100
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-06-21 03:59 +0100
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-06-21 03:59 +0100
Re: Why do circuit breakers go up for on and down for off? Jasen Betts <usenet@revmaps.no-ip.org> - 2023-06-21 06:57 +0000
Re: Troll-feeding Senile HUGE ASSHOLE Alert! Peeler <trolltrap@valid.invalid> - 2023-06-21 09:53 +0200
Re: Why do circuit breakers go up for on and down for off? jon <jon@nospam.cn> - 2023-06-21 09:14 +0000
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-21 17:05 +0100
Re: Why do circuit breakers go up for on and down for off? Max Demian <max_demian@bigfoot.com> - 2023-06-21 19:45 +0100
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-22 08:11 +0100
Re: Why do circuit breakers go up for on and down for off? jon <jon@nospam.cn> - 2023-06-22 10:22 +0000
Re: Why do circuit breakers go up for on and down for off? Bing AI <bing_ai@example.com> - 2023-06-22 13:27 +0100
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-07-25 04:02 +0100
Re: Why do circuit breakers go up for on and down for off? Jasen Betts <usenet@revmaps.no-ip.org> - 2023-06-24 00:27 +0000
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-07-25 04:03 +0100
Re: Why do circuit breakers go up for on and down for off? Fredxx <fredxx@spam.invalid> - 2023-06-21 17:16 +0100
Re: Why do circuit breakers go up for on and down for off? jon <jon@nospam.cn> - 2023-06-21 17:44 +0000
Re: Why do circuit breakers go up for on and down for off? Fredxx <fredxx@spam.invalid> - 2023-06-21 20:02 +0100
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-21 18:14 -0700
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-22 08:11 +0100
Re: Why do circuit breakers go up for on and down for off? "Jeff Gaines" <jgnewsid@outlook.com> - 2023-06-22 07:22 +0000
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-22 08:35 +0100
Re: Why do circuit breakers go up for on and down for off? "Jeff Gaines" <jgnewsid@outlook.com> - 2023-06-22 09:05 +0000
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-07-23 04:53 +0100
Re: Why do circuit breakers go up for on and down for off? Max Demian <max_demian@bigfoot.com> - 2023-07-23 11:18 +0100
Re: Troll-feeding Senile HUGE ASSHOLE Alert! Peeler <trolltrap@valid.invalid> - 2023-07-23 16:56 +0200
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-07-23 23:30 +0100
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-22 04:34 -0700
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-06-22 07:09 -0700
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-22 07:33 -0700
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-22 16:18 +0100
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-22 08:33 -0700
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-22 00:33 -0700
Re: Why do circuit breakers go up for on and down for off? John Larkin <jlarkin@highlandSNIPMEtechnology.com> - 2023-06-22 07:08 -0700
Re: Why do circuit breakers go up for on and down for off? The Natural Philosopher <tnp@invalid.invalid> - 2023-06-22 16:17 +0100
Re: Why do circuit breakers go up for on and down for off? Anthony William Sloman <bill.sloman@ieee.org> - 2023-06-22 08:22 -0700
Re: Why do circuit breakers go up for on and down for off? "Commander Kinsey" <CK1@nospam.com> - 2023-07-25 04:01 +0100
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| From | Bob F <bobnospam@gmail.com> |
|---|---|
| Date | 2023-05-10 13:31 -0700 |
| Subject | Re: Why do circuit breakers go up for on and down for off? |
| Message-ID | <u3guv8$pu30$1@dont-email.me> |
On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: > rbowman wrote on 3/12/2023 10:05 PM: >> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >> >>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> wrote: >>> >>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>> >>>> >>>>> Why were they never made of something more grippy than highly polished >>>>> steel? >>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>> Should be used on all tracks, then perhaps trains could stop in the >>> distance my car is required to by law. >> Do the math. A fully laden coal car weighs about 140 tons. I've never >> been >> bored enough to count cars when I stopped at a crossing but there are a >> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >> weight of the engines. Let's say 4 at 200 tons each. So, roughly 5000 >> tons >> traveling at 50 mph. That's quite a bit of kinetic energy to dump in >> 300'. >> I can hear snapping axles and see flying wheels. > > > The wheels and the rails are steel. A train can never have enough > friction to stop at a short distance. The brakes can lock all the wheels > but the train will still move forward due to inertia. All that need is train wheels made of rubber as hard as steel.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-10 23:04 +0200 |
| Message-ID | <mgdtijxq2f.ln2@Telcontar.valinor> |
| In reply to | #695455 |
On 2023-05-10 22:31, Bob F wrote: > On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: >> rbowman wrote on 3/12/2023 10:05 PM: >>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >>> >>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> wrote: >>>> >>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>>> >>>>> >>>>>> Why were they never made of something more grippy than highly >>>>>> polished >>>>>> steel? >>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>>> Should be used on all tracks, then perhaps trains could stop in the >>>> distance my car is required to by law. >>> Do the math. A fully laden coal car weighs about 140 tons. I've never >>> been >>> bored enough to count cars when I stopped at a crossing but there are a >>> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >>> weight of the engines. Let's say 4 at 200 tons each. So, roughly 5000 >>> tons >>> traveling at 50 mph. That's quite a bit of kinetic energy to dump in >>> 300'. >>> I can hear snapping axles and see flying wheels. >> >> >> The wheels and the rails are steel. A train can never have enough >> friction to stop at a short distance. The brakes can lock all the >> wheels but the train will still move forward due to inertia. > > All that need is train wheels made of rubber as hard as steel. If you do that, then those wheels will be very low friction and braking will be as bad as with steel wheels. You need something that is soft to increase the contact surface and grip. You have to choose, one thing or the other. Can't have both. > -- Cheers, Carlos.
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| From | SteveW <steve@walker-family.me.uk> |
|---|---|
| Date | 2023-05-10 23:07 +0100 |
| Message-ID | <u3h4is$qlgg$1@dont-email.me> |
| In reply to | #695458 |
On 10/05/2023 22:04, Carlos E.R. wrote: > On 2023-05-10 22:31, Bob F wrote: >> On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: >>> rbowman wrote on 3/12/2023 10:05 PM: >>>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >>>> >>>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> >>>>> wrote: >>>>> >>>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>>>> >>>>>> >>>>>>> Why were they never made of something more grippy than highly >>>>>>> polished >>>>>>> steel? >>>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>>>> Should be used on all tracks, then perhaps trains could stop in the >>>>> distance my car is required to by law. >>>> Do the math. A fully laden coal car weighs about 140 tons. I've >>>> never been >>>> bored enough to count cars when I stopped at a crossing but there are a >>>> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >>>> weight of the engines. Let's say 4 at 200 tons each. So, roughly >>>> 5000 tons >>>> traveling at 50 mph. That's quite a bit of kinetic energy to dump in >>>> 300'. >>>> I can hear snapping axles and see flying wheels. >>> >>> >>> The wheels and the rails are steel. A train can never have enough >>> friction to stop at a short distance. The brakes can lock all the >>> wheels but the train will still move forward due to inertia. >> >> All that need is train wheels made of rubber as hard as steel. > > If you do that, then those wheels will be very low friction and braking > will be as bad as with steel wheels. > > You need something that is soft to increase the contact surface and > grip. You have to choose, one thing or the other. Can't have both. Well you could have a train having steel wheels, but with rubber tyred wheels that could be dropped onto the track during heavy acceleration, heavy braking and for steep hills. But generally, steel wheels work well enough.
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| From | Fredxx <fredxx@spam.uk> |
|---|---|
| Date | 2023-05-11 01:19 +0100 |
| Message-ID | <u3hca3$rg4p$1@dont-email.me> |
| In reply to | #695461 |
On 10/05/2023 23:07, SteveW wrote: > On 10/05/2023 22:04, Carlos E.R. wrote: >> On 2023-05-10 22:31, Bob F wrote: >>> On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: >>>> rbowman wrote on 3/12/2023 10:05 PM: >>>>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >>>>> >>>>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> >>>>>> wrote: >>>>>> >>>>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>>>>> >>>>>>> >>>>>>>> Why were they never made of something more grippy than highly >>>>>>>> polished >>>>>>>> steel? >>>>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>>>>> Should be used on all tracks, then perhaps trains could stop in the >>>>>> distance my car is required to by law. >>>>> Do the math. A fully laden coal car weighs about 140 tons. I've >>>>> never been >>>>> bored enough to count cars when I stopped at a crossing but there >>>>> are a >>>>> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >>>>> weight of the engines. Let's say 4 at 200 tons each. So, roughly >>>>> 5000 tons >>>>> traveling at 50 mph. That's quite a bit of kinetic energy to dump >>>>> in 300'. >>>>> I can hear snapping axles and see flying wheels. >>>> >>>> >>>> The wheels and the rails are steel. A train can never have enough >>>> friction to stop at a short distance. The brakes can lock all the >>>> wheels but the train will still move forward due to inertia. >>> >>> All that need is train wheels made of rubber as hard as steel.. >> >> If you do that, then those wheels will be very low friction and >> braking will be as bad as with steel wheels. >> >> You need something that is soft to increase the contact surface and >> grip. You have to choose, one thing or the other. Can't have both. > > Well you could have a train having steel wheels, but with rubber tyred > wheels that could be dropped onto the track during heavy acceleration, > heavy braking and for steep hills. But generally, steel wheels work well > enough. If you had tyres, you could get rid of the rails. Do you think it'll catch on? Doesn't the Paris Metro have tyred plate-ways?
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| From | Tim W <nospam@example.com> |
|---|---|
| Date | 2023-05-11 09:31 +0000 |
| Message-ID | <u3icm0$127us$1@dont-email.me> |
| In reply to | #695470 |
On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: > If you had tyres, you could get rid of the rails. Do you think it'll > catch on? > > Doesn't the Paris Metro have tyred plate-ways? Yes - at least one line did in the 70s.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-11 14:19 +0200 |
| Message-ID | <t33vijxec3.ln2@Telcontar.valinor> |
| In reply to | #695490 |
On 2023-05-11 11:31, Tim W wrote: > On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: > > >> If you had tyres, you could get rid of the rails. Do you think it'll >> catch on? >> >> Doesn't the Paris Metro have tyred plate-ways? > > Yes - at least one line did in the 70s. https://en.wikipedia.org/wiki/The_Jackal_(1997_film) The last minutes, as the bad guy tries to flee in the Metro, it has rubber wheels. Supposedly in the Washington Metro, but I have never been there so I don't know. Google says it is the Radisson Metro Station in Montréal, Canada. Looking at the photos, you can see the rails are special. <https://www.wikiwand.com/en/Radisson_station> I have not found photos of the car wheels. Ah, here: https://www.youtube.com/watch?v=GJQV3euafZ8 -- Cheers, Carlos.
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| From | Bob F <bobnospam@gmail.com> |
|---|---|
| Date | 2023-05-11 06:48 -0700 |
| Message-ID | <u3irni$142u9$1@dont-email.me> |
| In reply to | #695494 |
On 5/11/2023 5:19 AM, Carlos E.R. wrote: > On 2023-05-11 11:31, Tim W wrote: >> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >> >> >>> If you had tyres, you could get rid of the rails. Do you think it'll >>> catch on? >>> >>> Doesn't the Paris Metro have tyred plate-ways? >> >> Yes - at least one line did in the 70s. > > https://en.wikipedia.org/wiki/The_Jackal_(1997_film) > > The last minutes, as the bad guy tries to flee in the Metro, it has > rubber wheels. Supposedly in the Washington Metro, but I have never been > there so I don't know. > > Google says it is the Radisson Metro Station in Montréal, Canada. > > Looking at the photos, you can see the rails are special. > > <https://www.wikiwand.com/en/Radisson_station> > > I have not found photos of the car wheels. Ah, here: > > https://www.youtube.com/watch?v=GJQV3euafZ8 > There is a big difference between a light rail passenger car and a railroad locomotive.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-22 13:46 +0200 |
| Message-ID | <s81sjjxsdh.ln2@Telcontar.valinor> |
| In reply to | #695497 |
On 2023-05-11 15:48, Bob F wrote: > On 5/11/2023 5:19 AM, Carlos E.R. wrote: >> On 2023-05-11 11:31, Tim W wrote: >>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>> >>> >>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>> catch on? >>>> >>>> Doesn't the Paris Metro have tyred plate-ways? >>> >>> Yes - at least one line did in the 70s. >> >> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >> >> The last minutes, as the bad guy tries to flee in the Metro, it has >> rubber wheels. Supposedly in the Washington Metro, but I have never >> been there so I don't know. >> >> Google says it is the Radisson Metro Station in Montréal, Canada. >> >> Looking at the photos, you can see the rails are special. >> >> <https://www.wikiwand.com/en/Radisson_station> >> >> I have not found photos of the car wheels. Ah, here: >> >> https://www.youtube.com/watch?v=GJQV3euafZ8 >> > > There is a big difference between a light rail passenger car and a > railroad locomotive. True. Locomotives could use rubber soles to increase traction, while the wagons could keep the metal ones to decrease friction. The locomotive could be lighter, then. Actually, I have a toy train that does just that :-D -- Cheers, Carlos.
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| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2023-05-22 12:58 +0100 |
| Message-ID | <u4flca$25l1u$4@dont-email.me> |
| In reply to | #696288 |
On 22/05/2023 12:46, Carlos E.R. wrote: > On 2023-05-11 15:48, Bob F wrote: >> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>> On 2023-05-11 11:31, Tim W wrote: >>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>> >>>> >>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>> catch on? >>>>> >>>>> Doesn't the Paris Metro have tyred plate-ways? >>>> >>>> Yes - at least one line did in the 70s. >>> >>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>> >>> The last minutes, as the bad guy tries to flee in the Metro, it has >>> rubber wheels. Supposedly in the Washington Metro, but I have never >>> been there so I don't know. >>> >>> Google says it is the Radisson Metro Station in Montréal, Canada. >>> >>> Looking at the photos, you can see the rails are special. >>> >>> <https://www.wikiwand.com/en/Radisson_station> >>> >>> I have not found photos of the car wheels. Ah, here: >>> >>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>> >> >> There is a big difference between a light rail passenger car and a >> railroad locomotive. > > True. > > Locomotives could use rubber soles to increase traction, while the > wagons could keep the metal ones to decrease friction. The locomotive > could be lighter, then. > The tyres wouldnt last ten miles. Which is probably as far as your model loco has ever travelled in its life. > Actually, I have a toy train that does just that :-D > James Mays 5 mile toy train line destroyed the brand new locos didnt it? > > -- The lifetime of any political organisation is about three years before its been subverted by the people it tried to warn you about. Anon.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-22 23:16 +0200 |
| Message-ID | <bn2tjjxca3.ln2@Telcontar.valinor> |
| In reply to | #696289 |
On 2023-05-22 13:58, The Natural Philosopher wrote: > On 22/05/2023 12:46, Carlos E.R. wrote: >> On 2023-05-11 15:48, Bob F wrote: >>> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>>> On 2023-05-11 11:31, Tim W wrote: >>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>>> >>>>> >>>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>>> catch on? >>>>>> >>>>>> Doesn't the Paris Metro have tyred plate-ways? >>>>> >>>>> Yes - at least one line did in the 70s. >>>> >>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>>> >>>> The last minutes, as the bad guy tries to flee in the Metro, it has >>>> rubber wheels. Supposedly in the Washington Metro, but I have never >>>> been there so I don't know. >>>> >>>> Google says it is the Radisson Metro Station in Montréal, Canada. >>>> >>>> Looking at the photos, you can see the rails are special. >>>> >>>> <https://www.wikiwand.com/en/Radisson_station> >>>> >>>> I have not found photos of the car wheels. Ah, here: >>>> >>>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>>> >>> >>> There is a big difference between a light rail passenger car and a >>> railroad locomotive. >> >> True. >> >> Locomotives could use rubber soles to increase traction, while the >> wagons could keep the metal ones to decrease friction. The locomotive >> could be lighter, then. >> > The tyres wouldnt last ten miles. Which is probably as far as your model > loco has ever travelled in its life. Maybe. Dunno. Although I'm not really talking of tyres, but an extra wheel with a rubber "coat" and no rim. > >> Actually, I have a toy train that does just that :-D >> > James Mays 5 mile toy train line destroyed the brand new locos didnt it? No, mine is "Ibertren". -- Cheers, Carlos.
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| From | rbowman <bowman@montana.com> |
|---|---|
| Date | 2023-05-23 02:49 +0000 |
| Message-ID | <kd2nubF991gU3@mid.individual.net> |
| In reply to | #696334 |
On Mon, 22 May 2023 23:16:59 +0200, Carlos E.R. wrote: > Although I'm not really talking of tyres, but an extra wheel with a > rubber "coat" and no rim. https://tiger1.info/EN/ExternalTyreWheels.html I believe the Tiger B did away with the rubber as did the later Tigers and Panthers. The Bs only weighed 75 tons though, well short of a locomotive.
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| From | Peeler <trolltrap@valid.invalid> |
|---|---|
| Date | 2023-05-23 11:10 +0200 |
| Subject | Re: lowbrowwoman, the Endlessly Driveling Senile Gossip |
| Message-ID | <bq%aM.4789721$US27.4379217@usenetxs.com> |
| In reply to | #696358 |
On 23 May 2023 02:49:48 GMT, lowbrowwoman, the endlessly driveling, troll-feeding, senile idiot, blabbered again: > I believe the Tiger B did away with the rubber as did the later Tigers and > Panthers. The Bs only weighed 75 tons though, well short of a locomotive. There they are again, your so very cherished "impressive" capital letters that you just can't get enough of, bigmouth! LOL -- Self-admiring lowbrowwoman telling everyone yet another "thrilling" story about her great life: "In a role reversal my mother taught her father to drive. She was in the back seat when he took his first test, trying a little telepathy: "release the handbrake. release the handbrake'. He didn't, stalled the engine and failed. The next time went better." MID: <kafp0uF6vi1U5@mid.individual.net>
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| From | Bob F <bobnospam@gmail.com> |
|---|---|
| Date | 2023-05-22 08:56 -0700 |
| Message-ID | <u4g3bm$274jh$1@dont-email.me> |
| In reply to | #696288 |
On 5/22/2023 4:46 AM, Carlos E.R. wrote: > On 2023-05-11 15:48, Bob F wrote: >> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>> On 2023-05-11 11:31, Tim W wrote: >>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>> >>>> >>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>> catch on? >>>>> >>>>> Doesn't the Paris Metro have tyred plate-ways? >>>> >>>> Yes - at least one line did in the 70s. >>> >>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>> >>> The last minutes, as the bad guy tries to flee in the Metro, it has >>> rubber wheels. Supposedly in the Washington Metro, but I have never >>> been there so I don't know. >>> >>> Google says it is the Radisson Metro Station in Montréal, Canada. >>> >>> Looking at the photos, you can see the rails are special. >>> >>> <https://www.wikiwand.com/en/Radisson_station> >>> >>> I have not found photos of the car wheels. Ah, here: >>> >>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>> >> >> There is a big difference between a light rail passenger car and a >> railroad locomotive. > > True. > > Locomotives could use rubber soles to increase traction, while the > wagons could keep the metal ones to decrease friction. The locomotive > could be lighter, then. > > Actually, I have a toy train that does just that :-D Do tell me where we can get traction rubber that would stand up to the incredible weight and forces of a freight locomotive.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-22 23:21 +0200 |
| Message-ID | <iv2tjjxca3.ln2@Telcontar.valinor> |
| In reply to | #696306 |
On 2023-05-22 17:56, Bob F wrote: > On 5/22/2023 4:46 AM, Carlos E.R. wrote: >> On 2023-05-11 15:48, Bob F wrote: >>> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>>> On 2023-05-11 11:31, Tim W wrote: >>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>>> >>>>> >>>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>>> catch on? >>>>>> >>>>>> Doesn't the Paris Metro have tyred plate-ways? >>>>> >>>>> Yes - at least one line did in the 70s. >>>> >>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>>> >>>> The last minutes, as the bad guy tries to flee in the Metro, it has >>>> rubber wheels. Supposedly in the Washington Metro, but I have never >>>> been there so I don't know. >>>> >>>> Google says it is the Radisson Metro Station in Montréal, Canada. >>>> >>>> Looking at the photos, you can see the rails are special. >>>> >>>> <https://www.wikiwand.com/en/Radisson_station> >>>> >>>> I have not found photos of the car wheels. Ah, here: >>>> >>>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>>> >>> >>> There is a big difference between a light rail passenger car and a >>> railroad locomotive. >> >> True. >> >> Locomotives could use rubber soles to increase traction, while the >> wagons could keep the metal ones to decrease friction. The locomotive >> could be lighter, then. >> >> Actually, I have a toy train that does just that :-D > > Do tell me where we can get traction rubber that would stand up to the > incredible weight and forces of a freight locomotive. The weight would be on the steel wheels. And perhaps, with more friction, the weight could be less. It is just an idea for playing. -- Cheers, Carlos.
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| From | Bob F <bobnospam@gmail.com> |
|---|---|
| Date | 2023-05-22 17:58 -0700 |
| Message-ID | <u4h331$2aamb$1@dont-email.me> |
| In reply to | #696336 |
On 5/22/2023 2:21 PM, Carlos E.R. wrote: > On 2023-05-22 17:56, Bob F wrote: >> On 5/22/2023 4:46 AM, Carlos E.R. wrote: >>> On 2023-05-11 15:48, Bob F wrote: >>>> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>>>> On 2023-05-11 11:31, Tim W wrote: >>>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>>>> >>>>>> >>>>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>>>> catch on? >>>>>>> >>>>>>> Doesn't the Paris Metro have tyred plate-ways? >>>>>> >>>>>> Yes - at least one line did in the 70s. >>>>> >>>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>>>> >>>>> The last minutes, as the bad guy tries to flee in the Metro, it has >>>>> rubber wheels. Supposedly in the Washington Metro, but I have never >>>>> been there so I don't know. >>>>> >>>>> Google says it is the Radisson Metro Station in Montréal, Canada. >>>>> >>>>> Looking at the photos, you can see the rails are special. >>>>> >>>>> <https://www.wikiwand.com/en/Radisson_station> >>>>> >>>>> I have not found photos of the car wheels. Ah, here: >>>>> >>>>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>>>> >>>> >>>> There is a big difference between a light rail passenger car and a >>>> railroad locomotive. >>> >>> True. >>> >>> Locomotives could use rubber soles to increase traction, while the >>> wagons could keep the metal ones to decrease friction. The locomotive >>> could be lighter, then. >>> >>> Actually, I have a toy train that does just that :-D >> >> Do tell me where we can get traction rubber that would stand up to the >> incredible weight and forces of a freight locomotive. > > The weight would be on the steel wheels. And perhaps, with more > friction, the weight could be less. So where are you planning to put the rubber to increase traction? > > > It is just an idea for playing. >
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-23 13:13 +0200 |
| Message-ID | <0njujjx1k1.ln2@Telcontar.valinor> |
| In reply to | #696351 |
On 2023-05-23 02:58, Bob F wrote: > On 5/22/2023 2:21 PM, Carlos E.R. wrote: >> On 2023-05-22 17:56, Bob F wrote: >>> On 5/22/2023 4:46 AM, Carlos E.R. wrote: >>>> On 2023-05-11 15:48, Bob F wrote: >>>>> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>>>>> On 2023-05-11 11:31, Tim W wrote: >>>>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>>>>> >>>>>>> >>>>>>>> If you had tyres, you could get rid of the rails. Do you think >>>>>>>> it'll >>>>>>>> catch on? >>>>>>>> >>>>>>>> Doesn't the Paris Metro have tyred plate-ways? >>>>>>> >>>>>>> Yes - at least one line did in the 70s. >>>>>> >>>>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>>>>> >>>>>> The last minutes, as the bad guy tries to flee in the Metro, it >>>>>> has rubber wheels. Supposedly in the Washington Metro, but I have >>>>>> never been there so I don't know. >>>>>> >>>>>> Google says it is the Radisson Metro Station in Montréal, Canada. >>>>>> >>>>>> Looking at the photos, you can see the rails are special. >>>>>> >>>>>> <https://www.wikiwand.com/en/Radisson_station> >>>>>> >>>>>> I have not found photos of the car wheels. Ah, here: >>>>>> >>>>>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>>>>> >>>>> >>>>> There is a big difference between a light rail passenger car and a >>>>> railroad locomotive. >>>> >>>> True. >>>> >>>> Locomotives could use rubber soles to increase traction, while the >>>> wagons could keep the metal ones to decrease friction. The >>>> locomotive could be lighter, then. >>>> >>>> Actually, I have a toy train that does just that :-D >>> >>> Do tell me where we can get traction rubber that would stand up to >>> the incredible weight and forces of a freight locomotive. >> >> The weight would be on the steel wheels. And perhaps, with more >> friction, the weight could be less. > > So where are you planning to put the rubber to increase traction? Similar to what rbowman posted about the tiger :-) >> It is just an idea for playing. -- Cheers, Carlos.
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| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2023-05-22 14:10 -0400 |
| Message-ID | <u4gb7g$27trh$1@dont-email.me> |
| In reply to | #696288 |
On 5/22/2023 7:46 AM, Carlos E.R. wrote:
> On 2023-05-11 15:48, Bob F wrote:
>> On 5/11/2023 5:19 AM, Carlos E.R. wrote:
>>> On 2023-05-11 11:31, Tim W wrote:
>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote:
>>>>
>>>>
>>>>> If you had tyres, you could get rid of the rails. Do you think it'll
>>>>> catch on?
>>>>>
>>>>> Doesn't the Paris Metro have tyred plate-ways?
>>>>
>>>> Yes - at least one line did in the 70s.
>>>
>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film)
>>>
>>> The last minutes, as the bad guy tries to flee in the Metro, it has rubber wheels. Supposedly in the Washington Metro, but I have never been there so I don't know.
>>>
>>> Google says it is the Radisson Metro Station in Montréal, Canada.
>>>
>>> Looking at the photos, you can see the rails are special.
>>>
>>> <https://www.wikiwand.com/en/Radisson_station>
>>>
>>> I have not found photos of the car wheels. Ah, here:
>>>
>>> https://www.youtube.com/watch?v=GJQV3euafZ8
>>>
>>
>> There is a big difference between a light rail passenger car and a railroad locomotive.
>
> True.
>
> Locomotives could use rubber soles to increase traction, while the wagons could keep the metal ones to decrease friction. The locomotive could be lighter, then.
>
> Actually, I have a toy train that does just that :-D
Like everything on trains, it's complicated.
https://en.wikipedia.org/wiki/Adhesion_railway
Who knew that the flanges didn't keep the train on the tracks :-)
*******
You could design trains, where all the wheels are driven. I expect
lighter rail solutions could be doing things like that.
One of the trains where I was born, were self-propelled cars run
on diesel. The longest of those trains, were three self-propelled cars
connected to one another. An "engineer" was located in a short cab area, and
was in control of propulsion settings. That train used to do 60 MPH
when outside of the yard limit, and did as well on the tracks it got to
use, as any national rail trains did.
The number of cars the provider would put on, depended on how many passengers
were expected. At it's height, they would put on three cars, and it
took something like six hours to reach the end of the line. The train
would then return the way it came and arrive back in the originating city.
Doing it that way, means you don't have a loco that weighs 400,000 pounds.
The wheels are still steel.
You can see it even has its own air horns on the car. And the train
does sound horns at level crossings. But the service life of these is
up, and they're no longer running and no similar replacement was designed.
But while they existed, these were excellent. You can see the car also
has an oscillator-light on the front, which rotates a bit, presumably to
attract the attention of careless pedestrians.
https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Dominion_Atlantic_Railway_9059_Train_2%2C_Dayliner%2C_at_Digby_Wharf%2C_Nova_Scotia_on_September_5%2C_1970_%2822263478920%29.jpg/1024px-Dominion_Atlantic_Railway_9059_Train_2%2C_Dayliner%2C_at_Digby_Wharf%2C_Nova_Scotia_on_September_5%2C_1970_%2822263478920%29.jpg
And while that picture makes it look like an elevated platform is required,
each car has a three-stair section that slides out, and you can "climb aboard"
from track level. No matter what "length" the train, there were two staff.
The "engineer" in the front of the lead car, and a "conductor" to punch tickets.
The conductor could do stuff, like slide the stairs out. Where we used to board,
we used the stairs, but I don't remember how the stairs work (retraction mechanism).
Paul
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2023-05-22 23:35 +0200 |
| Message-ID | <aq3tjjx4ct.ln2@Telcontar.valinor> |
| In reply to | #696309 |
On 2023-05-22 20:10, Paul wrote: > On 5/22/2023 7:46 AM, Carlos E.R. wrote: >> On 2023-05-11 15:48, Bob F wrote: >>> On 5/11/2023 5:19 AM, Carlos E.R. wrote: >>>> On 2023-05-11 11:31, Tim W wrote: >>>>> On Thu, 11 May 2023 01:19:16 +0100, Fredxx wrote: >>>>> >>>>> >>>>>> If you had tyres, you could get rid of the rails. Do you think it'll >>>>>> catch on? >>>>>> >>>>>> Doesn't the Paris Metro have tyred plate-ways? >>>>> >>>>> Yes - at least one line did in the 70s. >>>> >>>> https://en.wikipedia.org/wiki/The_Jackal_(1997_film) >>>> >>>> The last minutes, as the bad guy tries to flee in the Metro, it has >>>> rubber wheels. Supposedly in the Washington Metro, but I have never >>>> been there so I don't know. >>>> >>>> Google says it is the Radisson Metro Station in Montréal, Canada. >>>> >>>> Looking at the photos, you can see the rails are special. >>>> >>>> <https://www.wikiwand.com/en/Radisson_station> >>>> >>>> I have not found photos of the car wheels. Ah, here: >>>> >>>> https://www.youtube.com/watch?v=GJQV3euafZ8 >>>> >>> >>> There is a big difference between a light rail passenger car and a >>> railroad locomotive. >> >> True. >> >> Locomotives could use rubber soles to increase traction, while the >> wagons could keep the metal ones to decrease friction. The locomotive >> could be lighter, then. >> >> Actually, I have a toy train that does just that :-D > > Like everything on trains, it's complicated. > >   https://en.wikipedia.org/wiki/Adhesion_railway > > Who knew that the flanges didn't keep the train on the tracks :-) I knew :-) > > ******* > > You could design trains, where all the wheels are driven. I expect > lighter rail solutions could be doing things like that. > > One of the trains where I was born, were self-propelled cars run > on diesel. The longest of those trains, were three self-propelled cars > connected to one another. An "engineer" was located in a short cab area, > and > was in control of propulsion settings. That train used to do 60 MPH > when outside of the yard limit, and did as well on the tracks it got to > use, as any national rail trains did. > > The number of cars the provider would put on, depended on how many > passengers > were expected. At it's height, they would put on three cars, and it > took something like six hours to reach the end of the line. The train > would then return the way it came and arrive back in the originating city. > > Doing it that way, means you don't have a loco that weighs 400,000 pounds. > The wheels are still steel. Yes, this is done in Spain. Usually the underground Metro in Madrid works like that. In this case, I'm not sure how many cars are "powered", because the cars could be interconnected for electrical power. Also regional trains are often made this way. Long range, I'm not so sure. At least, those that are electrical. Diesel trains I think use a traditional loco (here). > You can see it even has its own air horns on the car. And the train > does sound horns at level crossings. But the service life of these is > up, and they're no longer running and no similar replacement was designed. > But while they existed, these were excellent. You can see the car also > has an oscillator-light on the front, which rotates a bit, presumably to > attract the attention of careless pedestrians. oscillator-lights? That's a very curious thing. I may have seen it on movies, but did not know if I was interpreting it correctly or not. > > https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Dominion_Atlantic_Railway_9059_Train_2%2C_Dayliner%2C_at_Digby_Wharf%2C_Nova_Scotia_on_September_5%2C_1970_%2822263478920%29.jpg/1024px-Dominion_Atlantic_Railway_9059_Train_2%2C_Dayliner%2C_at_Digby_Wharf%2C_Nova_Scotia_on_September_5%2C_1970_%2822263478920%29.jpg > > And while that picture makes it look like an elevated platform is required, elevated platforms are the norm here. Although there are some trains that are very low (the Talgo). > each car has a three-stair section that slides out, and you can > "climb aboard" from track level. No matter what "length" the train, > there were two staff. The "engineer" in the front of the lead car, > and a "conductor" to punch tickets. The conductor could do stuff, > like slide the stairs out. Where we used to board, we used the > stairs, but I don't remember how the stairs work (retraction > mechanism). -- Cheers, Carlos.
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| From | Bob F <bobnospam@gmail.com> |
|---|---|
| Date | 2023-05-10 19:09 -0700 |
| Message-ID | <u3hip5$vmk2$1@dont-email.me> |
| In reply to | #695461 |
On 5/10/2023 3:07 PM, SteveW wrote: > On 10/05/2023 22:04, Carlos E.R. wrote: >> On 2023-05-10 22:31, Bob F wrote: >>> On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: >>>> rbowman wrote on 3/12/2023 10:05 PM: >>>>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >>>>> >>>>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> >>>>>> wrote: >>>>>> >>>>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>>>>> >>>>>>> >>>>>>>> Why were they never made of something more grippy than highly >>>>>>>> polished >>>>>>>> steel? >>>>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>>>>> Should be used on all tracks, then perhaps trains could stop in the >>>>>> distance my car is required to by law. >>>>> Do the math. A fully laden coal car weighs about 140 tons. I've >>>>> never been >>>>> bored enough to count cars when I stopped at a crossing but there >>>>> are a >>>>> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >>>>> weight of the engines. Let's say 4 at 200 tons each. So, roughly >>>>> 5000 tons >>>>> traveling at 50 mph. That's quite a bit of kinetic energy to dump >>>>> in 300'. >>>>> I can hear snapping axles and see flying wheels. >>>> >>>> >>>> The wheels and the rails are steel. A train can never have enough >>>> friction to stop at a short distance. The brakes can lock all the >>>> wheels but the train will still move forward due to inertia. >>> >>> All that need is train wheels made of rubber as hard as steel. >> >> If you do that, then those wheels will be very low friction and >> braking will be as bad as with steel wheels. >> >> You need something that is soft to increase the contact surface and >> grip. You have to choose, one thing or the other. Can't have both. > > Well you could have a train having steel wheels, but with rubber tyred > wheels that could be dropped onto the track during heavy acceleration, > heavy braking and for steep hills. But generally, steel wheels work well > enough. > Clearly, no known rubber would support the weight of a train for any significant time. The f'ing steel wheels wear very significantly.
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| From | Jasen Betts <usenet@revmaps.no-ip.org> |
|---|---|
| Date | 2023-05-12 13:49 +0000 |
| Message-ID | <u3lg65$8s7$2@gonzo.revmaps.no-ip.org> |
| In reply to | #695461 |
On 2023-05-10, SteveW <steve@walker-family.me.uk> wrote: > On 10/05/2023 22:04, Carlos E.R. wrote: >> On 2023-05-10 22:31, Bob F wrote: >>> On 3/12/2023 7:43 PM, 😎 Mighty Wannabe ✅ wrote: >>>> rbowman wrote on 3/12/2023 10:05 PM: >>>>> On Mon, 13 Mar 2023 00:30:39 -0000, Commander Kinsey wrote: >>>>> >>>>>> On Thu, 02 Mar 2023 03:09:14 -0000, rbowman <bowman@montana.com> >>>>>> wrote: >>>>>> >>>>>>> On Wed, 01 Mar 2023 15:05:31 -0000, Commander Kinsey wrote: >>>>>>> >>>>>>> >>>>>>>> Why were they never made of something more grippy than highly >>>>>>>> polished >>>>>>>> steel? >>>>>>> https://en.wikipedia.org/wiki/Mount_Washington_Cog_Railway >>>>>> Should be used on all tracks, then perhaps trains could stop in the >>>>>> distance my car is required to by law. >>>>> Do the math. A fully laden coal car weighs about 140 tons. I've >>>>> never been >>>>> bored enough to count cars when I stopped at a crossing but there are a >>>>> lot of them. Let's say 30 for the sake of argument, 4200 tons plus the >>>>> weight of the engines. Let's say 4 at 200 tons each. So, roughly >>>>> 5000 tons >>>>> traveling at 50 mph. That's quite a bit of kinetic energy to dump in >>>>> 300'. >>>>> I can hear snapping axles and see flying wheels. >>>> >>>> >>>> The wheels and the rails are steel. A train can never have enough >>>> friction to stop at a short distance. The brakes can lock all the >>>> wheels but the train will still move forward due to inertia. >>> >>> All that need is train wheels made of rubber as hard as steel. >> >> If you do that, then those wheels will be very low friction and braking >> will be as bad as with steel wheels. >> >> You need something that is soft to increase the contact surface and >> grip. You have to choose, one thing or the other. Can't have both. > > Well you could have a train having steel wheels, but with rubber tyred > wheels that could be dropped onto the track during heavy acceleration, > heavy braking and for steep hills. But generally, steel wheels work well > enough. If they need extra traction they drop sand on the tracks. -- Jasen. 🇺🇦 Слава Україні
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