A 750V third rail EMU under the 25kV wires. 701013 passes South Marston on 16 May 2023, as it is hauled by 47727 Caisteal Dhun Eideann / Edinburgh Castle, running as the 5Q66 10:09 Willesden to Long Marston ECS. The train is just about to cross over onto the up line, using the crossover that can just be seen in the distance.