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Old January 25th 20, 09:30 AM posted to uk.railway,
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Default Third rail systems return path

On Fri, 24 Jan 2020 11:18:14 -0800 (PST)
d gone, the majority of the Southern was upgraded to 750 V with the only re=
maining 660 V sections in inner London (owing to the interfaces with London=
Underground at Wimbledon and Richmond (because C and D stock were 630 V un=
its whereas S stock is designed to operate at 750 V) and the fact that the =

Does the 750V mean only S stock is allowed on the Wimbledon and Richmond
branches now? How does this affect maintenance trains made up of old tube
stock for example?