British Rail Class 142

British Rail Class 142
Pacer
Arriva Trains Wales Class 142 at Cardiff Central in 2016
Arriva Trains Wales Class 142 interior in 2013
In service1985–2020
Manufacturer
Order no.
  • 31003 (DMS vehs. 55542–55591)[2]
  • 31004 (DMSL vehs. 55592–55641)
  • 31013 (DMS vehs. 55701–55746)
  • 31014 (DMSL vehs. 55747–55792)
Built atDerby Litchurch Lane Works
Family namePacer
Constructed1985–1987
Refurbished
  • 1997–2003
  • 2008–2017
Number built96
Number preserved35
Number scrapped60
Formation2 vehicles per unit: DMS-DMSL[1]
Diagram
  • DMS vehicles: DP234
  • DMSL vehicles: DP235[2]
Fleet numbers142001–142096[3]
Capacity102[4] to 121 seats[1]
Specifications
Car body constructionSteel[1]
Car length15.123 m (49 ft 7.4 in)[1]
Width2.800 m (9 ft 2.2 in)[1]
Height3.863 m (12 ft 8.1 in)[1]
DoorsDouble-leaf folding (three per side)
Wheelbase9.000 m (29 ft 6.3 in)[1]
Maximum speed75 mph (121 km/h)[1]
Weight
  • As built;[1]
  • DMS vehs.: approx. 21.0 tonnes (20.7 long tons; 23.1 short tons)
  • DMSL vehs.: approx. 21.5 tonnes (21.2 long tons; 23.7 short tons)
  • After upgrade;[5]
  • DMS vehs.: 24.5 tonnes (24.1 long tons; 27.0 short tons)
  • DMSL vehs.: 25.0 tonnes (24.6 long tons; 27.6 short tons)
Prime mover(s)
Engine typeInline-6 4-stroke turbo-diesel[7][8]
Displacement
  • Leyland: 11.1 L (680 cu in)[7]
  • Cummins: 10.0 L (610 cu in)[8]
  • (per engine)
Power output
  • Leyland: 149 kW (200 hp)[9]
  • Cummins: 168 kW (225 hp)[6]
  • (per engine)
Transmission
UIC classification1-A + A-1[10]
Minimum turning radius70 m (230 ft)[1]
Braking system(s)Electro-pneumatic (tread)[5]
('Westcode')
Safety system(s)
Coupling systemBSI[5]
Multiple workingWithin class, and with Classes 14x, 15x, and 170[5]
Track gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 142 Pacer are diesel multiple-unit passenger trains built for British Rail (BR) from 1985 to 1987. They were built with a high level of commonality with the widely used Leyland National bus. They are part of the Pacer family of railbuses. The last set was withdrawn from service in 2020.

  1. ^ a b c d e f g h i j k l m Vehicle Diagram Book No. 220 for Diesel Multiple Unit Trains (Railcars) (PDF). Derby: Mechanical & Electrical Engineering Department, British Railways Board. March 1987. DP234, DP235 (in work pp. 63–66). Archived from the original (PDF) on 21 January 2015 – via Barrowmore MRG.
  2. ^ a b Fox, Peter; Hughes, Barry (1994). British Railways Pocket Book No. 3: DMUs & Channel Tunnel Stock (7th ed.). Sheffield: Platform 5 Publishing. pp. 15–16, 25. ISBN 9781872524597.
  3. ^ "Class 142". The Railway Centre. Archived from the original on 9 March 2005. Retrieved 1 February 2016.{{cite web}}: CS1 maint: unfit URL (link)
  4. ^ "Passenger Focus response to Network Rail's North West Route Utilisation Strategy". Transport Focus. 11 January 2007. Archived from the original on 13 December 2020. Retrieved 1 December 2020.
  5. ^ a b c d e "Regional Passenger Trains: Class 142". London: Angel Trains. Archived from the original on 18 May 2018. Retrieved 22 December 2022.
  6. ^ a b Pritchard, R.N.; Fox, Peter (2009). British Railways Pocket Book No. 3: Diesel Multiple Units 2010. Sheffield: Platform 5 Publishing. p. 15. ISBN 978-1-902336-75-6. OCLC 614300319.
  7. ^ a b Leyland Titan Technical Data (PDF). Southall: British Leyland UK. June 1978. Lit. No. 1683. Archived (PDF) from the original on 31 January 2022. Retrieved 21 December 2022.
  8. ^ a b Engine Performance Curve LTA10-G2. Columbus, Indiana: Cummins Engine Company. 14 April 1997. FR-2254. Archived from the original (PDF) on 22 December 2022. Retrieved 22 December 2022.
  9. ^ a b Cite error: The named reference shore was invoked but never defined (see the help page).
  10. ^ Pritchard, Robert; Hall, Peter (14 February 2018). British Railways Locomotives & Coaching Stock 2018. Sheffield, England: Platform 5. p. 199. ISBN 978-1-909431-44-7.