66551 and 66534 worked 6A40, the 08:40 Merehead Quarry to Hanwell Bridge Loop stone train, past Hungerford Common two hours later than scheduled on 18 January 2024. On this occasion the train was made up of two sections, one for Harlow Mill, the other for Acton, which would split at Hanwell Bridge. The empties would recombine at Wembley in the evening before returning to Merehead overnight.