A stranger on the Great Western Mainline. Chiltern Railways 165027 passes South Marston on 28 July 2023 with the 3M65 13:09 Bristol Barton Hill to Wembley ECS. The unit was returning to London after receiving some maintenance at Bristol. GWR Turbo units are not normally seen on this line, and Chiltern 165/0s are obviously even more unusual.