37372 passes Grange Court in abysmal light on 18 November 1988, heading for Cardiff with Class 121 sandite unit TDB477486. I saw 37372 quite a few times, but this is the only occasion that I saw either of the Class 121 driving trailer sandite conversions. The former 56285 (TDB977486) & 56286 (TDB977466) were converted for sandite use in 1986. They looked very odd, as two of the three windows in the driving end were plated over (as can be seen here), and a single small window was inserted into the other end.