C426 (51364, 59516 & 51406) appears to have only been allocated to Cardiff for a couple of months during 1987, and this is my only picture of the unit carrying a 'C' prefix. It is pictured here approaching Hawkeridge Junction with another unidentified unit, whilst working the 2O56 10:10 Bristol Temple Meads to Weymouth service on 4 October 1987.