Bearing down

Getting my camera as close to the tracks as possible, we see First Great Western Class 150, 150129, as it speeds north with the 2C56 Penzance to Bristol Temple Meads.

The Class 150 and its derivatives are now a major part of Britain's commuter network, and also play an integral role in many of the rural branch lines and railway dependent settlements in connecting them to the rest of the country. Efficient, plucky and flexible, the Class 150's have always been a reliable instrument in the British Rail scene.

The planning of the Class 150 goes back to the early 1980's, where by this point many of the elderly Derby Lightweights and other 'Heritage' DMU's of the 1950's and 60's were in desperate need of replacement. The first consideration was the low cost Pacer units built by British Leyland that made their debut in 1984, but these units proved both unpopular and unreliable. As such, in addition to developing the Pacer, British Rail chose to build a more permanent unit based on the bodyshell of the MkIII carriage that had been used to form HST sets. The intention of the Class 150's was a unit that could provide both short distance commuter services as well as some longer distance trains. Areas of influence would be primarily outside of London, with commuter services connecting the cities of the North and the West Midlands, whilst more regional operations would connect the remote regions of Wales and Scotland to their nearest towns and cities.

By 1984, two prototypes had been built, consisting of three carriages and being fitted with two different engines for testing. 150001 was fitted with a Cummins powerplant with Voith Hydraulic Transmission, whilst 150002 was fitted with a Rolls Royce/Perkins engine and Self-Changing mechanical Transmission. These original units consisted of open plan interiors but no connecting gangways between units. After much testing primarily on the Midland Region around the Derby Test Centre, 150001's powerplant was chosen in favour of the Rolls Royce engine, which proved unreliable.

In competition with BREL was Metro-Cammell, who designed a pair of 3-car prototypes numbered Class 151. Although a very futuristic and space age looking machine, the Class 151's had troublesome gearboxes, resulting in violent gear shifts. Eventually, BREL's Class 150 was chosen for widespread production, and the Class 151's were withdrawn in 1989, languishing in Crewe before being scrapped in 2004 after suffering heavy vandalism. An advanced version of the Class 151 gearbox was however fitted to one of the Class 150 prototypes as a test for better design, this unit being dubbed Class 154. By this point however the gearbox design was outdated, and thus the unit was reverted back to its original specification.

From 1985, the first production Class 150/1's were released onto British Railways, working for the regional commuter sector known as Regional Railways. Their first points of influence were in Manchester and the West Midlands, operating on a wide variety of operations from longer distance services between Manchester, Blackpool, Liverpool, Barrow and Leeds, and in the Midlands from Birmingham to Kidderminster, Wolverhampton, Stratford-on-Avon and Shrewsbury. In total, 50 of these original units were built, distinguished by their lack of front gangway and non-sliding doors for the Driver's Cab.

To compliment this original fleet, a redesigned version of these units known as the Class 150/2 were built from 1986, and included a front-end gangway and all sliding doors. At the same time, the Class 150 bodyshell was used as a template for the Class 450 of Northern Ireland, a set of 9 nearly identical units with differing cab ends, one with a gangway, and one without. These units plied their trade across Northern Ireland until 2013 when they were all withdrawn, one unit preserved, and another in storage.

85 of the Class 150/2's were built, and began life working on almost the entire length and breadth of the network excluding London and the South East. These trains worked in Cornwall and Devon, the Highlands of Scotland, the Welsh Vallies, Trans-Pennine services between Manchester and Leeds, as well as along the East Coast of England from Newcastle to Lincoln and into Anglia. Both 150/1's and 150/2's differ from the original prototype by lack of a third intermediate trailer, although many Class 150/2's have been split to create hybrid 3-car units for extra capacity.

The only other member of the class to be built was the unique Class 180, a departmental track measurement unit fitted with computers and cameras to check the condition of the railway. It was redesignated Class 950 in 2000 following the introduction of the Class 180 Adalante units. This unit is still a common sight working for Network Rail.

Today all members of the fleet remain in service, but their original patterns have changed greatly. Class 150's no longer work in Scotland, but remain in heavy use around Manchester, Leeds, Liverpool, Newcastle and other locations in the North of England with Northern Rail. London Midland, operating around the West Midlands on what was Central Trains' network have sold off many of their units to other operators following the introduction of Class 172 units, although the company retains 3 units for the Bletchley to Bedford service. Formerly, the Class 150's operated for what was Silverlink on the Barking to Gospel Oak line in North London, the only instance these units have been used regularly in the capital, but have since been withdrawn by London Overground in place of Class 172's.

Today, First Great Western and Arriva Trains Wales hold a sizeable fleet to operate trains in and around the South of Wales and England, working from Penzance and Plymouth to Great Malvern, Brighton, Salisbury, and along the Welsh coast to Fishguard, Pembroke and Swansea, with operations being based between Bristol and Cardiff. Arriva does however have a wider influence with its units, operating also to Manchester (on some occasions), Chester, Aberystwyth, Holyhead, and along the north Welsh coast.