55020 (121020) & 55034 (121034) approach Princes Risborough is superb (and slightly unexpected) light on 19 May 2017 with the 2P65 17:26 Aylesbury to Princes Risborough Chiltern Railways service. This was the final day of bubble car operation on the line, and therefore the final working of vacuum braked first generation units on the entire network. With over 56 years of sterling service behind them, these vintage Pressed Steel units must rank as one of the best buys of any rolling stock ever to run in this country.