37230 passes South Moreton on 28 August 1991 with the 7A02 13:06 Princes Risborough to Didcot departmental working, conveying spent ballast from engineering work on the Chiltern Line. These departmental trains didn't always run to their booked time, but this one was running exactly to time (15:35 at Didcot East Junction on the relief line, according to the working timetable).