The VR Class Hr11 was the first class of line-haul diesel locomotives used by Valtionrautatiet (Finnish State Railways). Only five units were built, all delivered by Valmet in 1955. The Maybach diesel engines used in the locomotives proved highly unreliable, resulting in a complete overhaul of the engine-transmission system in 1956–58, but this did not solve all of the reliability problems. The Hr11 series was withdrawn from service in 1972.
History
VR (Finnish Railways) started a modernization project in the early fifties. VR had a small amount of diesel and gasoline-powered railcars since the 1920s, but in 1952 VR had only steam locomotives.
Modern aluminum-carriage diesel powered express multiple units (Dm3 and Dm4) were introduced in 1952. Related to these orders, VR ordered in 1952 five passenger train diesel locomotives with hydraulic transmission from Valmet Oy, Tampere. The locomotives were delivered in 1955.[1]