In uk.transport.london message
dia.com, Fri, 9 Jan 2009 03:38:34, Steve Dulieu steve.dulieu@greenyond
er.co.uk posted:

The SOP for this situation used to be to get a set of gap jumper leads
(basically a 640 volt extension lead, with a plug to go into the side
of the train on one end and a pair of shoes to go onto an adjacent
possie and neggie rail on the other) that were stored locally to where
trains could be gapped.

ISTM that each train could be equipped with an electric cable long
enough to reach either to the cable of a nearby train or to a shoe
assembly (or with an SCD, a winch, some rope, and an anchor).

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