The Pressed Steel company produced two classes of DMU during the late 1950s and early 1960s at their factory at Linwood, in Scotland - the three car Class 117s and the single car Class 121s. The Class 121s were effectively a Class 117 DMBS vehicle with a cab at both ends. As both types were allocated to the Western Region, there were various occasions when they operated together. Such was the case on 1 December 1983, when Class 117 L407 (51342, 59494 & 51384) and Class 121 L134 (55034) worked the 2A57 11:55 Oxford to Paddington service, seen here passing South Moreton (Didcot East).