In article ,
John Wright wrote:
When the LNER electrified the Manchester Sheffield and Wath section of
the MS&L over the Pennines the electric locos generated power under
retardation which was fed back into the catenaries for re-use. This
system was stopped when the use on that line (now closed altogether)
declined.

London Underground trains still work like this. Many buses have a flywheel
which is spun up when they brake, then used to help get it on the move
again.

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*OK, who stopped payment on my reality check?

Dave Plowman London SW
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