Sentinel 10255, its works number, left the production line on the 25th May 1966, being delivered into NCB ownership shortly after at their Baddesley Colliery in the South Midlands. Curiously, and unlike most other NCB examples the locomotive would not receive a running number, and would be known either by a name or its works number for most of its life. In the modern era the locomotive has changed hands a few times, being owned by Potter Logistics as their striking yellow 'Pride of the Fens' and Ed Murray and Sons.