66516 slowly passes South Marston on 30 June 2015 with the 4L31 09:03 Bristol to Felixstowe North freightliner. The track workers are getting ready to start digging trial holes for the forthcoming electrification masts. Presumably the blue markings on the ballast to the right of the loco indicates the position of a mast. Several further groups of men are already at work in the background. The lorry in the background was stationary for some time, as traffic on the slip road from the A419 onto the A420 had come to a complete stop, as the result of an accident.