Running nearly an hour late, 59204 passes South Marston on 9 July 2018 with the diverted 7A09 06:27 Merehead Quarry to Acton Mendip Rail 'jumbo' stone train. As it could only mange about a third of the speed of the following HSTs, it managed to severely hold up three of them, as it slowly plodded along the main line towards the loop at Challow.