An Inter-City express about to pass over a track mounted transponder.
Mercury a former Southern Region passenger coach, modified to take laboratory equipment, a 25KVA 240V 50Hz diesel generator and catering facilities for the technical staff.
Used in the transponder research investigating methods of track-train communication, leading to the development of the Control APT (C-APT) System.
During 1974 the test coach was hitched to any convenient train operating between London and Birmingham, travelling over this route three times a day, it allowed the initial transponders performance to be analysed.
An Inter-City express about to pass over a track mounted transponder.
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