21091 / 10012-012256-12048-11012 approaching Harrow-on-the-Hill. The S Stock was working train 443, the 1306 Aldgate to Uxbridge
Metropolitan Line service and the 1938 Tube Stock was working train 746, a 1311 Moorgate to Amersham heritage tour.
Date: 24 February 2019
Manipulation Notes: None
Camera mounted on a tall pole and remotely fired