British Rail Class 142

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British Rail Class 142 Pacer
142082 Penarth.jpg
Arriva Trains Wales Class 142 No. 142082 at Penarth
142082 Interior.jpg
The interior of an Arriva Trains Wales Class 142
In service 1985 - Present
Manufacturer British Rail Engineering Limited, Derby Litchurch Lane Works
Leyland Bus
Order no.
  • 31003 (55542-55591, DMS)
  • 31004 (55592-55641, DMSL)
  • 31013 (55701-55746, DMS)
  • 31014 (55747-55792, DMSL)[1]
Family name Pacer
Constructed 1985 - 1987[2]
  • 1997 - 2003
  • 2008 - Present
Number built 96 sets
Number in service 94 sets
Number scrapped 2 sets
  • 2 cars per trainset
  • DMS+DMSL[3]
Fleet numbers
  • 142001 - 142096[3] (set)
  • 55542-55591, 55701-55746 (DMS)
  • 55592-55641, 55747-55792 (DMSL)[3]
  • 102[5] to 121 seats per trainset
  • Northern:
  • 106, 114 or 121 seats per unit[6]
Line(s) served
Car body construction Steel underframe. Aluminium alloy body and roof.
Car length 15.55 m (51 ft 0 in)[2]
Width 2.8 m (9 ft 2 in)[2]
Height 3.86 m (13 ft)[2]
Articulated sections 2, flexible diaphragm[4] within unit only
Wheelbase 9 m (30 ft)[4]
Maximum speed 75 mph (120 km/h)[2]
Weight 48.23 t (47.47 long tons; 53.16 short tons) per trainset
Prime mover(s) Cummins LTA10-R 6-cylinder 10-litre[8]
Power output

225 hp (168 kW) at 2100 rpm[8]

(Originally fitted with Leyland TL11 6-cylinder 11.1-litre 205 hp (150 kW) at 1950 rpm)[2]
Transmission Mechanical - later converted to Hydraulic[2]
Train heating
  • Engine waste heat
  • Ducted warm air[4]
Braking system(s) Air[4]
Safety system(s) AWS,[4] TPWS
Coupling system BSI[9]
Multiple working Classes 14x, 15x and 170[2]
Track gauge 1,435 mm (4 ft 8 12 in) standard gauge

The British Rail Class 142 is a class of Pacer diesel multiple-unit passenger trains used in the United Kingdom. 96 units were built by British Rail Engineering Limited's Derby Litchurch Lane Works between 1985 and 1987. They were a development of the earlier Class 141 which were introduced in 1984.

They were initially built for use on rural branch lines. As at May 2018, Arriva Trains Wales operate fifteen units and Northern 79 units. All will be withdrawn by December 2019.


The unit's body is based on that of the original Leyland National bus, and many fixtures and fittings of the bus can be found on the units.[10][11] Each unit has a seating capacity of any number between 102[5] and 121 passengers per two-car set. In theory there should be 106 or 121 seats per unit.[12] However, many units have had seats removed to provide additional space for wheelchair access.[citation needed] The same engines and mechanical transmissions were used as on Class 141, as also the same double-folding external doors. Each car has a fuel capacity of 125 gallons.[13]

Rail squeal[edit]

Excessive flange squeal on tight curves has been a problem on many routes operated by 142s,[14] caused by the long wheelbase and lack of bogies. The rough ride which can result has led to the units' being nicknamed (along with the related Class 143s) Nodding Donkey. The 142s were officially known as "Skippers" when they were briefly allocated to Cornwall in the mid-1980s. They were transferred elsewhere when they proved unsuitable for the sharply curved branch lines there.

Upgrades and refurbishments[edit]

The class was upgraded in the early 1990s. All units carry a more powerful Cummins engine - 230 bhp per car, which equals 460 bhp (340 kW) per twin-car unit - and Voith two-stage hydraulic transmission, starting with a torque converter which switches to fluid coupling drive once the unit is up to 45 miles per hour (72 km/h).[15] This has proven successful, although incidents have occurred, such as when a Northern Rail unit derailed en route from Blackpool to Liverpool in June 2009.[16]


British Rail Provincial/Regional Railways[edit]

142088 in the original British Rail Provincial railbus two-tone blue livery at Castleford.

From new, some units were painted according to the region they operated in. For example, the first 14 Greater Manchester Passenger Transport Executive sponsored units (142001-014) received GMPTE orange and brown, then the next 13 West Country based units (142015-027) were painted in a Great Western Railway inspired chocolate and cream livery and marketed as 'Skippers'.[17]

Post privatisation[edit]

Northern England[edit]

Northern Spirit liveried Class 142 No. 142066 at Wakefield Kirkgate
The interior of a Northern Spirit refurbished Class 142

Upon the privatisation of British Rail, the Class 142 Fleet was divided between North Western Trains in the North West and Northern Spirit in the North East.

Northern Spirit started its operations in 1997 and continued until 2000. At this point, parent company MTL ran into difficulties and the company was sold to Arriva, who renamed it as Arriva Trains Northern.

In 1998 ATN swapped seven Class 142s (142085-142091) for seven Class 150/2 units from Valley Lines.[18]

In 2004 First North Western and Arriva Trains Northern were merged into the Northern rail franchise, which inherited the combined fleet of 79 Class 142s.

All 79 Class 142s are now painted in Northern Rail livery. Due to rising passenger numbers in the north of England (by about 10% per annum and even by over 25% per annum at some stations where 142s are in operation),[11] some units have been replaced by Sprinter trains.[19]

Five Class 142 Pacers, in service with First Great Western, were returned to Northern Rail in December 2008; the rest returned to Northern Rail by November 2011, much later than originally planned.

Despite being built for branch-line stopping services, the Class 142s are mainly used on urban commuter services in and out of cities like Liverpool, Manchester, Sheffield, Leeds and Newcastle and can be seen on longer-distance services of up to three hours including the 1632 Middlesbrough-Carlisle service (nearly 110 miles); they had also been used on services between Blackpool North and Chester via Stockport, which ceased to operate in December 2008. All 79 passed with the Northern franchise to Arriva Rail North in April 2016.

Class 142s have operated the following routes:


A total of seventeen Class 142 units based at Newton Heath TMD (142041-049 and 142051-058) were refurbished for use on Merseyside Passenger Transport Executive's City Line on services around the Liverpool and Greater Manchester areas.[20] The refurbishment included dot-matrix route indicators, a new design of individual low-backed seating and the units were repainted into Merseyrail's livery. Upon privatisation these units passed to First North Western in March 1997. All of these sets are now with Northern and however remain in the livery of previous operator Northern Rail.


Valley Lines acquired its Class 142s by swapping Class 150/2 units with Arriva Trains Northern. The Class 142s were initially painted in Valley Lines livery.

Arriva Trains Wales uses its Class 142 Pacer trains on the commuter lines around Cardiff, Barry and Penarth known as the Valley lines. All of its Class 142 Pacer fleet now bear the turquoise and cream house colours of Arriva Trains Wales.

The Class 142s are frequently used for the Cardiff to Penarth service calling at Grangetown, Dingle Road and Penarth.

The Class 142 units are also primarily used on South Wales Valley line routes and routes through the Vale of Glamorgan. On Valley and Vale of Glamorgan services, Class 142s are often coupled together with Class 143 or Class 150 units to cope with demand on the busy Valley Lines network. The Class 142s have received minor refurbishments with retrimmed seats in new moquette, plus the installation of ceiling-mounted CCTV cameras.

South West England[edit]

Twelve Class 142 Pacers were received by First Great Western in 2007, and started operations in December 2007. These were loaned from Northern (where they had been stored), in part to cover for refurbishment of FGW's Sprinter fleets but also to allow the Class 158s to be reformed as three-coach sets.

The 142s were based at Exeter TMD, working alongside the similar Class 143s on services in Devon and Cornwall, including the Avocet Line, Riviera Line and Tarka Line.

Five 142s were returned to Northern Rail in the autumn of 2008, following the completion of the refresh of Class 150 Sprinter units. The remaining seven units were returned to Northern Rail in November 2011 after being replaced by class 150 units cascaded from London Overground and London Midland.


All 94 Class 142s will be withdrawn by December 2019, as they do not comply with the Persons of Reduced Mobility Technical Specification for Interoperability (PRM-TSI).[21]

Bidders for the Northern franchise that commenced in April 2016 were required to order new DMUs and take on Sprinters and Turbostars released by other franchises as replacement.[22] The Long Term Passenger Rolling Stock Strategy for the Rail Industry indicates up to 500 non-electric carriages will need to be built in the short term.[23] Northern withdrawals are scheduled to commence in November 2018 with the last to be removed from traffic in October 2019.[24]

New Wales & Borders franchise holder KeolisAmey Wales will replace all of its Class 142s by December 2019.[25]


Fleet details[edit]

Pioneer unit 142001 at Blackburn
Class Operator No. Built Cars per Set Unit nos.
Class 142 Arriva Trains Wales 15 1985–1987 2 142002, 142006, 142010, 142069, 142072-142077, 142080-142083, 142085
Northern 79 142001, 142003-142005, 142007, 142009, 142011-142058, 142060-142068,
142070-142071, 142078-142079, 142084, 142086-142096

Vehicle Number - when built ran like this:

  • 1st order 142001-142050 55542-55591 55592-55642
  • 2nd order 142051-142096 55701-55746 55747-55792

Named units[edit]

  • Arriva Trains Wales pacer unit 142073 received a name "Myfanwy" - however it was later denamed.[26]
  • Former First North Western named a unit "142009 - Newton Heath 125 1876-2001" however once the franchise ended, the unit was later denamed.[27]
  • Arriva Trains Wales pacer unit 142080 was named "Caerphilly R.F.C" [28] but was denamed when it was refurbished.


  • There have been a number of accidents involving Class 142s since their introduction, the most serious of which happened at Winsford in 1999. The driver of Class 142 No. 142008 operated by First North Western, running empty from Crewe to Liverpool Lime Street overran a red signal on the slow line and stopped in the path of the 06:15 London Euston to Glasgow Central Virgin Trains express, hauled by a Class 87 electric locomotive, No. 87027 Wolf of Badenoch.[29] The impact, which caused the unit to be written off, severed the Pacer's body from its frames and caused severe internal damage. This raised concerns over the crashworthiness of the design.[30][31]
  • On 11 June 2009, a Class 142 (No. 142042) operated by Northern Rail derailed while en route from Blackpool to Liverpool. All but one of the 40 passengers on board escaped injury. An initial investigation was carried out by the UK Rail Accident Investigation Branch which determined that the engine mounted under the rear coach became detached and fell onto the track at a recorded speed of 57 mph, derailing the rear axle. The detachment of the engine caused extensive damage to underfloor equipment, severing control wires and damaging the braking system resulting in an automatic emergency brake application. The engine became detached following the failure of its attachment to the flywheel housing. Two of the three engine mounting points are on the flywheel housing which remained attached to the vehicle. Engine parts were recovered and taken to the engine overhauler’s workshops for supervised examination and dismantling. The bearings and other internal engine parts were found to be in order with no signs of overheating or seizure. The engine crankshaft had broken between the big end bearing of the 6th cylinder and the main bearing in the engine casing at the flywheel end. This break exhibited marks characteristic of a fatigue failure. The torque load on the crankshaft of an engine on full power is at its maximum between the last cylinder and the flywheel, the location of the fracture. A piece of main bearing and its fixing bolt were the first items found in the debris trail towards the derailed train at 453m back from where the train stopped. The engine block was 205m back from the stopped train. The track was damaged over a distance of 330m. The engine had been overhauled, and was fitted to 142042 in March 2008. The crankshaft had been used in two other engines prior to being fitted to this engine. It had been reground and subjected to magnetic particle inspection (MPI) to check for flaws before it was fitted to this engine. The unit had covered 114,577 miles since returning to service. The rebuilt engines were given an interval of 400,000 miles between overhauls. Subsequently, newer more sensitive MPI equipment was introduced by the engine overhaulers.[32] Problems with engines on 142s have been experienced before.[33]
  • 142008 and 142059 have been withdrawn, both through accident damage. 142008 was wrecked in the Winsford disaster of 1999, and 142059 was withdrawn in 1991 after colliding with a buffer stop at Liverpool Lime Street. The train had run away down the hill from Edge Hill whilst returning with brake problems. The train was running without passengers at the time and the driver and guard both survived the accident without serious lasting injury. The platforms were evacuated in time before the train struck the buffers.[34][35]
  • On 3 October 2009, a unit of the class collided with another train at Darlington.[36]
  • A cardan shaft failure led to an incident at Durham on 10 April 2011, injuring a member of the public with a piece of ballast kicked up by the detached shaft.[37]
  • On 27 April 2012 142091 was working the 1125 Lincoln - Adwick service when it hit a landslide after exiting Clarborough Tunnel near Retford causing major frontal damage to the unit. Two people were taken to hospital with minor injuries, one of these being the driver.[38][39] The landslide was blamed on heavy rain and poor drainage.[39] The unit has since returned to service.
  • On 8 August 2009, Arriva Trains Wales unit 142069 derailed during an empty stock movement at Rhymney, South Wales. The unit was preparing to work a morning service with 143625 when it derailed on a set of points and hit the platform edge. 142069 was later removed by road to Cardiff Canton depot and fears were raised that the frame might have been damaged beyond repair. These fears proved unfounded and the unit has since returned to service.
  • On 4 January 2010, unit 142 029 collided with a train comprising two Class 159 diesel multiple units at Exeter St Davids. Nine people were injured.[36]
  • On 4 October 2016, unit 142 072 caught fire at Caerphilly.[40]

John Pugh, Liberal Democrat MP for Southport, has described the 142 trains as "unsafe". However the UK Government's former Transport Secretary Geoff Hoon denied this claim saying, "I would not accept that any of that rolling stock is unsafe", and that they constantly upgrade them.[41][42]



  1. ^ a b c Fox & Hughes 1994, pp. 15–16, 25
  2. ^ a b c d e f g h Colin J Marsden. "Class 142 Technical Data". Archived from the original on 20 March 2012. Retrieved 24 March 2010. 
  3. ^ a b c "Class 142". The Railway Centre. Archived from the original on 9 March 2005. Retrieved 1 February 2016. 
  4. ^ a b c d e f Vehicle Diagram Book No. 220 for Diesel Multiple Unit Trains (Railcars) (PDF). Barrowmore MRG. Derby: British Railways Board. 1982. DP234, DP235. 
  5. ^ a b "Passenger Focus response to Network Rail's North West Route Utilisation Strategy" (PDF). Network Rail. January 2007. Retrieved 2 December 2015. 
  6. ^ "The Northern Interim Franchise Agreement" (PDF). Bevan Brittan LLP. 26 March 2014. Retrieved 22 April 2015. 
  7. ^ Fox 1987, p. 41
  8. ^ a b Pritchard & Fox 2009, p. 15
  9. ^ "Mechanical and Electrical Coupling Index". Rail Safety and Standards Board. Archived from the original on 21 December 2013. Retrieved 13 October 2010. 
  10. ^ "Diesel Multiple Unit Stock". Goods & Not So Goods. Archived from the original on 4 March 2016. Retrieved 2 December 2015. 
  11. ^ a b "Mid Cheshire Rail Users Association" (PDF). Network Rail. Retrieved 2 December 2015. 
  12. ^ "142 - BREL/Leyland Pacer". Data Sheets. Angel Trains. Retrieved 8 July 2008. [dead link]
  13. ^
  14. ^ Glendinning, Alec (26 March 2014). "The Network Rail (Ordsall Chord) Order" (PDF). Network Rail. p. 11. Retrieved 18 February 2016. 
  15. ^
  16. ^ "Passengers stranded by derailment". BBC News. 12 June 2009. Retrieved 2 December 2015. 
  17. ^ "Cornish Capers". 
  18. ^ "Northern Spirit and Cardiff swap DMUs" Rail Magazine issue 340 23 September 1998 page 9
  19. ^ "More trains for busy routes" (PDF). Railwatch. Railfuture. July 2007. p. 3. Retrieved 2 December 2015. 
  20. ^ "Pacer Page 1- Class 142". pacerchaser. Retrieved 25 April 2015. 
  21. ^ Clinnick, Richard (1 May 2013). "Angel Trains to withdraw all its Class 142 Pacers by 2020". Rail. 721. Peterborough. p. 11. 
  22. ^ "Northern Invitation to Tender" (PDF). Department for Transport. Retrieved 2 December 2015. 
  23. ^ "More rolling stock needed as passenger growth rises again". Railnews. 9 March 2015. Retrieved 2 December 2015. 
  24. ^ "Northern announces dates for rundown of Pacer fleet" Rail Express issue 244 September 2016 page 11
  25. ^ Electrification and train-trams in ambitious Wales franchise Railway Gazette International 6 June 2018
  26. ^ "DMU FORMATIONS". AbRail. Retrieved 27 March 2015. 
  27. ^ "Class 142". 
  28. ^
  29. ^ "Train driver averts disaster". BBC News. 23 June 1999. Retrieved 2 December 2015. A train driver has prevented a major disaster by braking seconds before his express ploughed into another train. 
  30. ^ "Safety fears over commuter trains". BBC News. 2 July 1999. Retrieved 4 July 2008. The railway inspectors say lightweight rail-bus trains do not meet current safety standards and they are concerned that some of them are now being used on the same tracks as conventional heavyweight inter-city and freight trains. 
  31. ^ "Far-reaching implications for Pacer safety". Railway Magazine. May 2000. p. 18. 
  32. ^ "RAIB Bulletin 09/2009" (PDF). Rail Accident Investigation Branch. Retrieved 2 December 2015. 
  33. ^ Anderson, Vicky (12 June 2009). "Dozens flee derailed train in Liverpool". Liverpool Echo. Archived from the original on 19 March 2012. 
  34. ^
  35. ^
  36. ^ a b "Report 10/2010 Collision at Exeter St Davids station 4 January 2010" (PDF). Rail Accidents Investigation Branch. Retrieved 13 February 2010. 
  37. ^ "Investigation into an incident at Durham station, 10 April 2011". Rail Accident Investigation Board. 10 April 2011. Archived from the original on 12 November 2014. 
  38. ^ "Landslide derails Northern Rail passenger train in Clarborough". BBC News. 27 April 2012. Retrieved 13 August 2012. 
  39. ^ a b "Nottinghamshire train derailment prompts national review". BBC News. 13 August 2012. Retrieved 13 August 2012. 
  40. ^ White, Bethany (4 October 2016). "These shocking pictures show the moment a fire caused a train to fill with smoke while passengers were on board". Walesonline. Media Wales Ltd. Retrieved 5 October 2016. 
  41. ^ "MP says trains in area are 'unsafe'". Lancashire Evening Post. Preston. 17 February 2009. Retrieved 2 December 2015. 
  42. ^ Siddle, John (2 January 2009). "Northern Rail, which runs the Southport to Manchester line, told to improve its services after announcing ticket price hikes". Southport Visiter. Archived from the original on 16 July 2011. Retrieved 2 December 2015. 


  • Fox, Peter (1987). Multiple Unit Pocket Book. British Railways Pocket Book No.2 (Summer/Autumn 1987 ed.). Platform 5 Publishing Ltd. ISBN 0906579740. OCLC 613347580. 
  • Fox, Peter; Hughes, Barry (1994). DMUs & Channel Tunnel Stock. British Railways Pocket Book No.3 (7th ed.). Platform 5. ISBN 9781872524597. 
  • Pritchard, R.N.; Fox, Peter (2009). Diesel Multiple Units 2010. British Railways Pocket Book No.3. Platform 5. ISBN 978-1-902336-75-6. OCLC 614300319. 

External links[edit]

Media related to British Rail Class 142 at Wikimedia Commons