50042 Triumph whilst allocated to the DCWA engineer's pool between 1988 and its withdrawal in 1990 performed numerous duties such as this. It is pictured heading east from Didcot and approaching South Moreton on 24 October 1989 with the 11:50 Bristol to Old Oak Common, comprising HST power car 43140 and a barrier vehicle. Presumably this would have been switched to the relief line at some point.