HOR R40214 Hornby BR Departmental, ex-Mk1 BCK, Test Coach ‘Mercury’, RDB975280 – Era 7 | 2022 Catalogue

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.