Class 150 Sprinter
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| Class 150 Sprinter | |
|---|---|
 | |
| Name | Class 150 Sprinter |
| Service | 1984–present |
| Manufacturer | BREL |
| Family | Sprinter |
| Yearconstruction | 1984–1987 |
| Numberbuilt | 137 |
| Formation | 2-car sets |
| Operator | British Rail, Greater Anglia, ScotRail, Northern Trains, Transport for Wales, West Midlands Trains |
| Carbody | Steel |
| Carlength | 23.0 m per car |
| Maxspeed | 75 mph |
| Engine | Cummins NT855-R5 |
| Transmission | Hydraulic |
Class 150 Sprinter is a British twin-car diesel multiple unit introduced in the mid-1980s by British Rail as part of the Sprinter family to replace first-generation diesel multiple units such as Class 101 and Class 108. Built by British Rail Engineering Limited at Derby Litchurch Lane Works, the units were intended for regional and local services across England, Scotland, and Wales, operating under multiple post-privatisation train operating companies including Railtrack successors and contemporary franchises.
Design and Development
The Class 150 originated from British Rail's 1980s Modernisation Programme and the need to replace ageing second-generation DMUs alongside units like the Class 155 and Class 156. Designed by BREL engineers influenced by prior projects at Doncaster Works and York Works, the 150 employed a welded steel carbody similar to the Mark 2 coaching stock and shared mechanical subsystems with Class 153 conversions and the broader Sprinter family. Initial trials involved collaborations with Rail Research Division and testing on routes radiating from London Fenchurch Street and Birmingham New Street before fleetwide introduction.
Technical Specifications
Each two-car set consists of driving motor cars with Cummins diesel engines coupled to Voith hydraulic transmissions, drawing on components used in Class 151 prototypes and Class 158 designs. The units feature air-operated sliding doors, rheostatic braking complemented by conventional pneumatic systems, and standard TOPS classifications used across Network SouthEast and later franchises. Performance parameters included a maximum speed of 75 mph and seating capacities suitable for regional operation; bogies were derived from proven designs used on Mark 3 derivatives and maintenance regimes followed standards set by the Rail Safety and Standards Board.
Variants and Subclasses
Subclasses arose during production and through subsequent reconfigurations: the early production batches, mid-series with minor electrical upgrades, and later reclassifications following single-car conversions into Class 153 by Central Trains contractors. Notable subclass distinctions mirrored those seen across fleets like Class 156 and Class 158 where interior layout, heating, and passenger information systems differed to meet operator requirements under franchises such as FirstGroup and Arriva.
Operational History
Initially allocated to sectorised regions including Regional Railways and London Midland, the fleet saw deployment on commuter and rural services across corridors like Great Eastern Main Line branch routes and Scottish regional lines from Glasgow Queen Street and Edinburgh Waverley. Following privatisation, individual units transferred between operators including ScotRail, Northern Trains, Transport for Wales, Greater Anglia and West Midlands Trains with cascades triggered by arrivals of newer types such as Class 170 and Class 170 Turbostar. The Class 150 also featured in charter workings and emergency diagrams coordinated with Network Rail during disruption and infrastructure works.
Interior and Passenger Facilities
Passenger accommodation initially followed regional standards with 2+3 seating arrangements in some batches and 2+2 in others, reflecting precedents set by interiors on Sprinter siblings. Onboard facilities evolved to include passenger information systems compatible with franchise-specific branding from operators like Northern Rail and TransPennine Express during short-term leases. Accessibility modifications over time brought units into partial compliance with standards championed by Disability Rights Commission initiatives and later Department for Transport accessibility guidance.
Refurbishments and Modifications
Multiple refurbishment programmes occurred under different operators: internal re-trims, installation of electronic passenger information displays, and retrofits for improved reliability coordinated with maintenance depots such as Heaton TMD and Longsight Depot. Conversion programmes included single-car splits producing Class 153 units, off-vehicle shop retrofits, and renewals aligning with rolling stock leasing company directives from firms like Angel Trains and Eversholt Rail Group. Some units received engine and transmission overhauls coordinated with original suppliers including Cummins and Voith.
Accidents and Incidents
Units have been involved in collisions and derailments investigated by the Rail Accident Investigation Branch and earlier by the Accident Investigation Branch of Department of Transport. Notable incidents prompted fleet safety reviews and recommendations concerning signalling interactions on interlocking routes near locations such as Salisbury and Wigan, with operator-level responses from franchises including Northern Rail and ScotRail to implement remedial measures and procedural changes.
Category:British Rail diesel multiple units Category:BREL multiple units