<p>During the 1990's refurbishment the trailing ends of the trailer cars were fitted with basic driving controls inside a locked cabinet - these were for use when shunting individual two-car units in depots - instead of a driver in the driver's cab driving backwards being aided by a person at the other end of the train shouting instructions.
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This photograph was taken when a C stock train showing proposed changes was on public display at Hammersmith (Met) station.
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