55034 (121034) approaches Saunderton on 9 April 2017 with the Branch Line Society 1Z20 09:42 Aylesbury to Marylebone 'Bubble and Squeak Tracker' railtour. After becoming used to the Chiltern Railways Class 121s pottering slowly between Aylesbury and Princes Risborough, it was like the good old days to witness this running at what appeared to be full speed of 70mph. This tour was organised to mark the forthcoming end of Chiltern Railways bubble car operations.