The Hertfordshire Railtours 1Z22 09:25 Marylebone to Chinnor and Thame 'Chinnor Tonic' railtour approaches Horsenden Lane on 9 July 1988, on what is now the Chinnor & Princes Risborough Railway, but what at the time was still a BR line open for freight traffic to Chinnor Cement Works. After having traversed the whole length of the branch, 51652 leads the Class 115/108 combination (51652, 54500, 54222, & 51654) towards the junction with the Thame branch, which was also still open for freight at the time.