RDB975280


Laboratory 18 - 'MERCURY'

Mercury a former Southern Region passenger coach, modified to take laboratory equipment, a 25KVA 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
An Inter-City express about to pass over a track mounted transponder.

RDB975280 Test Coach 'Mercury'RDB975280 Test Coach 'Mercury'RDB975280 Test Coach 'Mercury'
Monitoring transponder performance on-board 'Mercury'


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Last Revised: 27.05.2021 10:09
by R G Latham
© 1998