D6515 (33012) Lt Jenny Lewis RN brings up the rear of the London Transport Museum 1Z33 10:22 Harrow-on-the-Hill to Quainton Road (via Calvert) 'Class 20 Metropolitan' Railtour at Greatmoor on 29 April 2018. 20227 & 20142 are at the front of the train. The train is just approaching the site of Grendon Underwood Junction, where the line to Ashendon Junction on the Chiltern Line diverged to the right. This was latterly cut back to the UKF fertiliser depot at Akeman Street. The line closed in in the early 1990s, and the trackbed has now been converted into a road to access a new waste disposal plant.