2D-020-005 N Gauge Class 153 153333 Transport For WalesThe British Rail Class 153 is single car diesel multiple unit that was converted from the British Leyland built twin car Class 155. The conversion was done by Hunslet Barclay in Kilmarnock and 70 Class 153s were converted from 35 class 155 twin car sets. The 153 entered service in 1991 and has continued in service to the present day, operating on the less critical intercity routes and some branch line work, taking over many of the duties previously