D6515 (33012) Lt Jenny Lewis RN passes Greatmoor on 29 April 2018 with the London Transport Museum 1Z33 10:22 Harrow-on-the-Hill to Quainton Road (via Calvert) 'Class 20 Metropolitan' Railtour. 20227 & 20142 are on the rear. This location is approximately half way between Quainton Road and Calvert, and reached by a long and exceedingly muddy bridleway.