Friday 19 May 2017 was a significant date in UK railway history, with the last run of a first generation DMU on the national network. In near darkness, and pouring rain, 55034 (121034) & 55020 (121020) pass Southcourt (on the southern edge of Aylesbury) with the very last working, the 2A55 19:30 Princes Risborough to Aylesbury Chiltern Railways service. There is just over a mile to go before the train arrives at Aylesbury station, bringing to an end over half a century of vacuum braked multiple unit working.