150238 approaches Culham on 3 July 1991 with the 2A35 17:37 Cheltenham Spa to Oxford service. This unusual working explains the presence of a Class 150 in the Thames Valley, an area more used to seeing Class 117 & 119 heritage units at the time. The most common second generation DMU in the area then was the Class 155, which had also operated this service the year before.