Note the shed in the background and the second vehicle is a Cornish Riviera Express brake 3rd.

Stuart Davies says " The train hauled by 3633 is the 3.35pm ex Clarbeston Road 30th July 1958. How a Centenary Brake got to Fishguard is anybody's guess but having got it must have been regarded as a prize possession until the authorities ordered its return to more prestigious duties".