31422 & 37168 pass Margaretting on 8 May 1985 with the 8C35 10:17 Marks Tey to Mile End loaded vacuum braked sand hoppers. This train was booked for a pair of 31s, one of which was often an ETH 31/4, taking a break from local parcels duties. However, what I didn't expect was this Class 31/37 combination. A nice surprise, which corresponded with the only short spell of weak sunshine during the entire day.