British Rail Class 142

British Rail Class 142
*Pacer*
British Rail Class 142; Pacer
	An Arriva Trains Wales Class 142 at Cardiff Central in 2016
	The Arriva Trains Wales Class 142 interior in 2013
In service	1985–2020
Manufacturer	British Rail Engineering Limited; Leyland Vehicles Limited;
Order no.	31003 (DMS vehs. 55542–55591); 31004 (DMSL vehs. 55592–55641); 31013 (DMS vehs. 55701–55746); 31014 (DMSL vehs. 55747–55792);
Built at	Derby Litchurch Lane Works
Family name	Pacer
Constructed	1985–1987
Refurbished	1997–2003; 2008–2017;
Number built	96
Number preserved	35
Number scrapped	60
Formation	2 vehicles per unit: DMS-DMSL
Diagram	DMS vehicles: DP234; DMSL vehicles: DP235;
Fleet numbers	142001–142096
Capacity	102 to 121 seats
Specifications
Car body construction	Steel
Car length	15.123 m (49 ft 7.4 in)
Width	2.800 m (9 ft 2.2 in)
Height	3.863 m (12 ft 8.1 in)
Doors	Double-leaf folding (three per side)
Wheelbase	9.000 m (29 ft 6.3 in)
Maximum speed	75 mph (121 km/h)
Weight	As built;; 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;; 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)	As built:; 2 × Leyland TL11; After upgrade:; 2 × Cummins LTA10-R; (one per vehicle);
Engine type	Inline-6 4-stroke turbo-diesel
Displacement	Leyland: 11.1 L (680 cu in); Cummins: 10.0 L (610 cu in); (per engine);
Power output	Leyland: 149 kW (200 hp); Cummins: 168 kW (225 hp); (per engine);
Transmission	As built:; SCG RRE5 (4-sp. epicyclic); After upgrade:; Voith T 211 r (hydrokinetic);
UIC classification	1-A + A-1
Minimum turning radius	70 m (230 ft)
Braking system(s)	Electro-pneumatic (tread); (Westcode)
Safety system(s)	AWS; TPWS;
Coupling system	BSI
Multiple working	Within class, and with Classes 14x, 15x and 170
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

Class 142 diesel multiple unit passenger trains were built for British Rail (BR) from 1985 to 1987, 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 The last set was withdrawn from service in 2020.