Thanks, I wasn't aware of this. Presumably the Pompey units as well?The 1930s express stock on the SR (6PUL, 5BEL and so on) had motor generators and 70v control circuits. The 4SUBs, though later, did everything at line voltage for compatibility with the existing SUB fleet.
I was going to ask the same question myself! Presumably it was 'lift music' kind of stuff back then. As someone for whom what they play in McDonalds is totally alien tuneless noise the concept of music on trains today doesn't bear thinking about!What sort of music would it have been Mr B, are we talking Brahms or the Sex Pistols?