55020 (121020) passes milepost 45¾, as it heads through the trees near Little Kimble with the 09:17 Princes Risborough to Aylesbury Chiltern Railways service on 24 May 2010. Nearly fifty years old and still earning a living on the national network - not a bad record and something that a lot of modern units will probably never achieve. However, this vintage unit doesn't exactly have a demanding schedule, being confined to morning and evening peak trains on this quiet local line.