The unique Class 117/101/117 hybrid ser B450 approaches Abbotswood on 17 March 1984, whilst working the 09:42 Gloucester to Worcester Shrub Hill. As there were only 39 Class 117 TCL trailers built, in contrast to 42 each of the DMS & DMBS driving cars, there was always going to be a problem forming up the entire class into three car sets. Although DMBS 51357 was written off as early as 1968, and DMS 51403 was withdrawn in 1982, this still left a shortfall of two centre cards. Therefore B450 (51394, 59547 & 51352) utilised a Class 101 trailer, whilst B439 had a Class 118 centre car (much less obvious to the casual observer).