Transport for Wales
Class 150 fleet
150208 52208 57208
150 242 (Peter Dickinson)
150 256 (Ken Robinson)
150 229 (Eddie Knorn)
Technical Specification | Operations | Livery | Historical Notes
A 2-car Class 150 diesel railcar set comprises two steel-bodied driving motor cars, each 19.74 metres long, built in 1986-87 by the York works of BREL to a design based on the Mk3 hauled coach bodyshell. One vehicle of each pair, the 52xxx vehicle, has a toilet compartment at its inner end.
The oldest series, Class 150/1, have no corridor connections in the cab ends, and hand-operated crew doors, whereas the later 150/2 series have corridor connections and powered doors for the crew. All TfW units are 150/2s.
Each car has one Cummins NT855R5 diesel engine of 213 kW (285 HP) driving both axles of the bogie at the non-driving end through a Voith hydraulic transmission and Gmeinder final drives, identical to the drive equipment of Class 153 and 156. Maximum speed is 75 mph. Air suspension units are provided for each bogie, the three-step air-operated brakes have a variable load feature, and public address equipment is fitted.
Class 150 units have BSI (Bergische Stahl Industrie) outer couplers, and can work in multiple with Classes 142, 150, 153 and 158.
There were 85 two-car 150/2 units built; three coaches have been withdrawn due to accident damage. Other users of the type are Northern - whose trains can be seen at Chester - and Great Western.
Arriva Trains Wales started life in 2003 with just five units of the 150/2 type which came from the Cardiff Railway Company, which had refurbished them with 2 + 2 seating in place of the original cramped 3 + 2 type. From 2005, many more 150/2s arrived at Cardiff depot, transferred from other companies. These had old-style 3+2 seats when they arrived, but were refurbished to the same standard as the others and repainted in Arriva standard livery. These units enabled the Wrexham - Bidston service, and the Conwy Valley service in summer, to be worked by 2-car 150s instead of the single-car 153s previously used.
The majority of Class 150 workings are in the South Wales area, the Shrewsbury - Lllanelli route, and the Crewe - Shrewsbury stopping service, but from time to time they can often be seen substituting for unavailable Class 158 or 175 on longer-distance expresses such as Manchester - Cardiff and Holyhead - Cardiff, despite having a lower maximum speed that those types. They cannot be used on the Cambrian lines to Aberystwyth and Pwllheli as they are not fitted for the ERTMS signalling used there.
For a while, from 2008, six sets, in full Arriva Trains Wales livery, were 'temporarily' in use by First Great Western in the West of England, although officially part of the ATW fleet, and there have been loans to other companies from time to time.
Arriva Trains Wales, following their takeover of the franchise, repainted all their Class 150 units in the standard Arriva branding (above) based on the Arriva group bus livery. More recently, overhauled units received the 'Welsh Government' colours (heading picture) based on the livery chosen for the loco-hauled express coaches. At the time of writing (2018) any new application of the red and grey TfW livery is awaited.
By the early 1980s no new diesel railcars for local services had been built for British Rail in 20 years, and replacement was becoming matter of urgency. From 1983 onwards a series of 4-wheeled vehicles was built (Class 142) but these supposedly cheap trains soon showed their inadequacy. Two prototype diesel-electric trains (class 210) based on the Mk 3 coach were built, but these were thought too expensive. BREL and Metro-Cammell were asked in early 1983 to build prototypes diesel-hydraulic trains suitable for both local and long-distance services, and BREL produced two Class 150 sets based on the Class 455 electric trains then in quantity production for suburban services south of London. Metro-Cammell's version, the Class 151, was delayed into service for various reasons, with the result that rather than the intended comparative testing, 50 two-car Class 150s were ordered, and 37 of these were ready to take over all workings based at Derby Etches Park depot on 20 January 1986.
The production trains differed from the prototypes in having just two coaches per unit instead of three, a result of someone in Whitehall arbitrarily deciding that two new cars would be sufficient to replace three of the old ones. The two three-car prototype sets, 150 001 and 150 002, are still in traffic in 2008 with London Midland; their centre vehicles are the only Class 150 cars without driving cabs.
Built in 1987 on the Class 150 production line was the unique track-recording unit, 950 001, which is used by Network Rail for track-assessment duties, especially on lines where locomotive-hauled trains are not allowed. It looks like a 150/1 with fewer doors and windows, and carries video camera and other equipment on the ends.
A second order for 85 two-car units, which became Class 150/2, was placed in 1986, and delivery began before the end of that year. Some of these second-wave units were first used to replace locomotive-hauled trains on the Trans-Pennine expresses, a duty for which their high-density seating layout was far from suitable; by the time they were moved to local services elsewhere a couple of years later, they already seemed travel-weary. The original seats, known as the 'Ashbourne' type, fell apart on a regular basis and had to be rebuilt, the floors rotted, and various other matters needed attention, although they did not suffer from the major problems found in some other units.
In 2018 the 150s continue operating past their 30th birthday, and have shown themselves to be very reliable mechanically, although the interiors are not up to modern standards. They remain divided between TfW, Northern and Great Western; TfW have a plan to replace them during the course of the franchise with new stock, and electrification on the Great Western line has allowed transfer of some of their units to Northern, who are refurbishing them for continued use to into the 2020s.
Compiled by Charlie Hulme, with thanks to many other sites, especially abrail.co.uk. Comments welcome.