Over fifty years old, and still going strong! 55020 (121020) must be one of the oldest vehicles still in revenue earning service on the national network. Here it is still making money for Chiltern Railways on 10 August 2012, as it passes North Lee with the 2P82 08:58 Aylesbury to Princes Risborough service. Its normal daily work is a series of early morning and late afternoon trips on this quaint rural backwater, which frees up a Class 165 unit for other duties.