The Blue Angel (in Dutch: Blauwe Engel) was the name given to the Plan X class DE-1 diesel railcars formerly used by the Netherlands Railways. These streamlined single carriage DEMUs were built by Allan of Rotterdam in 1953-54. They were extensively used on the branch lines in Friesland as well as on other non-electrfied secondary routes. They also operated the Maastricht-Liege shuttle. Originally painted blue (hence the nickname), they were later repainted dark red. They were largely replaced by new Wadloper DMUs in the 1980s.