Description
At the beginning of the 1980s, British Rail (BR) had a large fleet of ageing "Heritage" DMUs, built to many different designs in the late 1950s and early 1960s. Some of the more reliable types were retained and refurbished. However, BR decided to replace many of the non-standard or unreliable types with new second generation units, built to modern standards. Two different types were pursued; low-cost "Pacers" built using bus parts and used on short-distance services; and "Sprinters" built for longer-distance services.
Twenty-three Class 144 units were built. The units have a maximum speed of 75 mph (121 km/h) and are externally similar to the earlier Class 143 Pacers (they have a Walter Alexander body like the Class 143), built in 1985–1986. The first thirteen of the class, No. 144001-013 are 2-car units. The remaining ten, No. 144014-023 are all 3-car units, although all were originally built as 2-car units, the centre vehicle being added later. These ten Pacers are the only Pacers to contain intermediate vehicles.
Units are formed of two driving motors, one of which contains a toilet. The 3-car units have an additional intermediate motor. All vehicles have standard-class seating only. The technical description of the formation is DMS+(MS)+DMSL. Individual vehicles are numbered as follows.
- 55801-55823 - DMS
- 55850-55859 - MS (units 144014-023 only)
- 55824-55846 - DMSL
Read more about this topic: British Rail Class 144
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