Thanks for that picture. So we are preserving the history of the Victoria line?
Note that the 115 V AC output from the motor-alternator set is just as isolated as the 50 V DC. The way you would emulate the 115 V AC in a museum setting would be by the use of a suitable 240 V to 115 V isolation transformer. Happily, such transformers should be relatively easy to procure. With such an isolation transformer you could also connect one pole to the car body without any worries of short circuits or trips.
From an authenticity perspective it would be nice to keep the original fluorescent lighting intact and not replace it with LEDs as suggested by some.
Yeah we are keeping the fluorescent tubes
. just replacing the original ballast with 240v ones. We use to run them off a 110V transformer but they are 20 years old now and a lot of them are dying. 110V ballast are hard to get hold of so. We hire it to a lot of filming companies too who have requested selective control repeatedly so we are adding that but its all behind the seens stuff that doesn't affect the look and feel of the car.
Heres an old pic of the full windings:
They use a lot of odd voltages probably to account for voltage drops.
I can take a hi res pic of the full thing if you like