Groups > alt.folklore.computers > #152927

Re: optimum power supply for subway/light rail lines

Newsgroups	alt.folklore.computers
Date	2015-10-14 12:37 -0700
References	<5932e6a1-4930-466c-8bb8-4baadf9e9e77@googlegroups.com> <da9d50b2-3ada-45ff-bb1b-ef88ca43d84a@googlegroups.com> <mvm5vu$qfl$1@dont-email.me>
Message-ID	<4e3e929c-d97f-4ab8-a622-95084e6b00a2@googlegroups.com> (permalink)
Subject	Re: optimum power supply for subway/light rail lines
From	hancock4@bbs.cpcn.com

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On Wednesday, October 14, 2015 at 2:15:25 PM UTC-4, Stephen Sprunk wrote:
> For subways and trams, where train density is high and power per train
> is low, low-voltage DC has a lower total cost.  For intercity rail,
> where train density is low and power per train is high, high-voltage AC
> has a lower total cost.  So, that's what you see in practice.

Usually.  The Reading, Pennsylvania, and Hew Haven systems used 11KV 25Hz.

However, the Long Island and New York Central suburban districts used 600V third rail.  I think this was because at the time those networks were built, AC systems weren't quite perfected yet.  The New Haven was the first, and a Westinghouse publication of that era admits there were a lot of bugs to be worked out.  

Another exception was the Delaware, Lackawanna, and Western suburban system, which used higher voltage DC (I think 3,000 volts).  That was built at the same time as the Reading's system (1930).

Thread

optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-24 11:00 -0700
  Re: optimum power supply for subway/light rail lines "hqhy" <hqhy@nospam.com> - 2015-08-25 04:47 +1000
    Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-24 15:01 -0500
  Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-24 14:45 -0500
    Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-24 13:22 -0700
      Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 13:26 -0500
        Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 11:48 -0700
          Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 16:12 -0500
            Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 20:20 -0700
        Re: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 20:28 +0000
  Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-08-24 21:42 +0200
    Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-24 15:14 -0500
      Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 08:07 -0700
        Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 12:52 -0500
          Re: optimum power supply for subway/light rail lines scott@slp53.sl.home (Scott Lurndal) - 2015-08-25 20:06 +0000
  Re: optimum power supply for subway/light rail lines Jon Elson <elson@pico-systems.com> - 2015-08-24 23:33 -0500
    Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 01:39 -0500
      Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-08-25 10:23 +0200
        Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 12:30 -0500
          Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-08-25 22:48 +0200
            Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-26 10:44 -0500
              Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-08-26 18:03 +0200
              Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-26 12:04 -0700
      Re: optimum power supply for subway/light rail lines Jon Elson <jmelson@wustl.edu> - 2015-08-25 14:15 -0500
        Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 15:15 -0500
          Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 13:33 -0700
            Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 15:49 -0500
              Re: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 21:00 +0000
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 16:37 -0500
                Re: optimum power supply for subway/light rail lines lawrence@cluon.com - 2015-08-25 23:52 +0200
                fluorescents, was: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 22:25 +0000
                Re: fluorescents, was: optimum power supply for subway/light rail lines lawrence@cluon.com - 2015-08-26 04:13 +0200
                Re: fluorescents, was: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 20:24 -0700
                Re: optimum power supply for subway/light rail lines JimP <solosam90@gmail.com> - 2015-08-25 19:11 -0500
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 20:36 -0700
                Re: optimum power supply for subway/light rail lines Michael Black <et472@ncf.ca> - 2015-08-26 02:29 -0400
                Re: optimum power supply for subway/light rail lines JimP <solosam90@gmail.com> - 2015-08-26 09:35 -0500
              Re: optimum power supply for subway/light rail lines andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2015-10-11 17:24 +0000
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-13 07:30 -0700
                Re: optimum power supply for subway/light rail lines andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2015-10-15 19:32 +0000
            Re: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 20:52 +0000
              Re: optimum power supply for subway/light rail lines "Joseph D. Korman" <joekor@earthlink.net> - 2015-08-28 14:34 -0400
            Re: optimum power supply for subway/light rail lines Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-08-26 04:03 +0000
          Re: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 20:36 +0000
    Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-08-25 08:10 -0700
      Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-08-25 12:18 -0500
        Re: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-08-25 17:30 +0000
  Re: optimum power supply for subway/light rail lines Quadibloc <jsavard@ecn.ab.ca> - 2015-10-12 22:15 -0700
    Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-13 07:37 -0700
    Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-14 13:15 -0500
      Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-14 12:37 -0700
        Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-14 14:57 -0500
          Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-14 13:30 -0700
            Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-15 11:26 -0500
              Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-16 07:19 -0700
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-16 15:55 -0500
                Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-10-17 00:10 +0200
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-21 13:12 -0500
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-21 13:23 -0700
                Re: optimum power supply for subway/light rail lines Peter Flass <peter_flass@yahoo.com> - 2015-10-21 17:56 -0400
                Re: optimum power supply for subway/light rail lines scott@slp53.sl.home (Scott Lurndal) - 2015-10-22 17:53 +0000
                Re: optimum power supply for subway/light rail lines John Levine <johnl@iecc.com> - 2015-10-24 00:46 +0000
                Re: optimum power supply for subway/light rail lines Walter Bushell <proto@panix.com> - 2015-11-04 12:38 -0500
                Re: optimum power supply for subway/light rail lines Peter Flass <peter_flass@yahoo.com> - 2015-10-21 17:56 -0400
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-22 10:56 -0500
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-22 10:09 -0700
                Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-10-22 19:44 +0200
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-22 14:38 -0500
                Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-10-22 23:40 +0200
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-23 13:29 -0500
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-23 11:39 -0700
                Re: optimum power supply for subway/light rail lines Michael Black <et472@ncf.ca> - 2015-10-23 15:52 -0400
                Re: optimum power supply for subway/light rail lines Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-23 21:40 +0100
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-23 16:55 -0500
                Re: optimum power supply for subway/light rail lines Morten Reistad <first@last.name.invalid> - 2015-10-23 22:18 +0200
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-25 21:04 -0500
                Re: optimum power supply for subway/light rail lines Peter Flass <peter_flass@yahoo.com> - 2015-10-26 07:17 -0400
                Re: optimum power supply for subway/light rail lines "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-26 14:48 -0500
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-26 15:54 -0500
                Re: optimum power supply for subway/light rail lines "78lp" <78lp@nospam.com> - 2015-10-28 07:07 +1100
                Re: optimum power supply for subway/light rail lines Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-23 21:36 +0000
                Re: optimum power supply for subway/light rail lines "78lp" <78lp@nospam.com> - 2015-10-24 16:01 +1100
                Re: optimum power supply for subway/light rail lines "78lp" <78lp@nospam.com> - 2015-10-23 08:19 +1100
                Re: optimum power supply for subway/light rail lines Peter Flass <peter_flass@yahoo.com> - 2015-10-23 05:57 -0400
                Re: optimum power supply for subway/light rail lines Dave Garland <dave.garland@wizinfo.com> - 2015-10-22 14:12 -0500
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-23 14:27 -0500
                Re: optimum power supply for subway/light rail lines Dave Garland <dave.garland@wizinfo.com> - 2015-10-23 16:16 -0500
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-23 20:05 -0700
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-25 00:53 -0500
                Re: optimum power supply for subway/light rail lines "78lp" <78lp@nospam.com> - 2015-10-25 17:49 +1100
                car rentals, was: optimum power supply for subway/light rail lines danny burstein <dannyb@panix.com> - 2015-10-25 12:47 +0000
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-23 19:55 -0700
                Re: optimum power supply for subway/light rail lines Peter Flass <peter_flass@yahoo.com> - 2015-10-24 07:16 -0400
                Re: optimum power supply for subway/light rail lines Greymaus <mausg@mail.com> - 2015-10-24 18:11 +0000
                Re: optimum power supply for subway/light rail lines hancock4@bbs.cpcn.com - 2015-10-24 20:18 -0700
                Re: optimum power supply for subway/light rail lines Stephen Sprunk <stephen@sprunk.org> - 2015-10-24 23:55 -0500
                Re: optimum power supply for subway/light rail lines scott@slp53.sl.home (Scott Lurndal) - 2015-10-22 18:01 +0000

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