90s and 91s would have to be dragged to reach the GWML wouldn't they? Can a 92 access it from 3rd rail land?
I think I'd be right in thinking that every other stretch of 25kV OHL on the national network (so excluding any test tracks etc) is, in some way, connected?
IIRC correctly, they could get from Paddington to the WCML under power by reversing at North Pole onto the Kennsington Olympia line for a short distance before running to Willesden. What can be done today I do not know.