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From: rbowman <bowman@montana.com>
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Subject: Re: OT - TV
Date: 10 Oct 2026 00:46:27 GMT
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On Fri, 9 Oct 2026 22:32:09 +0200, Carlos E. R. wrote:

> Over here big trucks (I don't know about tractor+trailers, harder to
> see)
> have some sort of electric brake. Seems like a big generator installed
> on the longitudinal axle. Maybe they short circuit it, or put some
> resistors across the terminals. Or maybe they apply battery electricity
> to electromagnets near a moving metal disc(s).

afaik only e-trucks have systems like that so far. 'Electric brakes' are 
used on some smaller trailers. They are conventional brakes actuated by 
electric solenoids where the towing vehicle doesn't have an air 
compressor. They're definitely better than nothing.

I briefly worked for a railroad in the early '70s so my information may be 
dated. They did have regenerative braking since the traction motors were 
electric, hence diesel-electric. The motors were shunted to a very large 
resistor bank.

https://en.wikipedia.org/wiki/List_of_EMD_locomotives#/media/
File:CCP_2008_19930000_IL.jpg

The resistor compartment is at the read. You can make out a little bit of 
the fan than was solely used to dissipate the wasted energy from the 
resistors rather than cooling the diesel.