R40214 BR Infrastructure Brake Composite Coach "Test coach Mercury" No.RDB975280

R40214 BR Infrastructure Brake Composite Coach "Test coach Mercury" No.RDB975280

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Test Coach 18 'Mercury' was used to test the track based transponders utilised by the C-APT system. Throughout 1974 'Mercury' would be coupled to almost any available West Coast Mainline train many times per day.