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Oh, so that's what it is...
Back in the late 70's and early 80's 'British Rail Engineering Ltd' were experimenting with that idea, there was a test train based at Strawberry Hill that I was showen round when I was at school. That was a case of putting power back into the 'third rail' system rather than batteries. They ran their tests in the small hours because if it went wrong it would blow the signal system!
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