Observant passengers travelling behind 43040 Bristol St. Philip's Marsh on the 1A75 05:05 Penzance to Paddington GWR service, were in for a surprise shortly after this picture was taken at South Marston on 9 July 2018. Because the slow moving diverted 7A09 06:27 Merehead Quarry to Acton Mendip Rail 'jumbo' stone train was in front of it, the HST used the bi-directional signalling capability of the Great Western Mainline to overtake it, by using the crossovers at Bourton and Uffington.