EV Voltage

Do you mean actually equipment from an EV car or the concept of putting batteries into a former DC supplied electric train with equipment rated to do the job? If the latter then work has been going on for sometime with a company who purchased a lot of former District line vehicles from the London Underground called Vivarail. Like lot of these things the task took longer than anticipated and the company went into administration. However gWr purchased the remains and continued the project and is testing on the Greenford branch in London. Details here

GH

Put a used EV battery in an old SR EMU, drive it on electric with no third rail, something no EMU has done in preservation. I think the guard's compartment in a lot of them would be enough to fit an EV battery, if the ~200kg weight is something they can take (~3 pax, so probably).

That's way above the budget of the average heritage railway.

Theo

Well you didn’t even mention heritage railway in your previous post, some old prewar tube trains that survived on the Isle of Wight till a few years ago were acquired by various groups some of which proposed to convert them to battery. Nothing so far though ,they will probably rust away before anything happens. Old electric trains don’t appeal to the general public like steam trains, the attempts to preserve them are frequently down to a small group of say half a dozen people who can barely stem the corrosion and most heritage railways haven’t got room for something several coaches long that doesn’t move. The ones that do are off the beaten track so difficult to reach , one of the old tube trains could only find a home in South Wales. Several projects have ended up just delaying the inevitable appointment with a gas axe.

GH

Thanks for that - most interesting. I particularly like Fig.11 Step 5 - "Contacts weld closed"!