British Rail Class 143

British Rail Class 143 "Pacer"
143605 at Cardiff Central railway station
In service	1985 - present
Manufacturer	Andrew Barclay and Walter Alexander
Family name	Pacer
Number built	25
Number in service	23
Number scrapped	2
Formation	2 car
Capacity	106
Operator	Arriva Trains Wales First Great Western
Line(s) served	Bristol local lines, Valley Lines
Specifications
Car length	15.2 metres
Width	2.7 metres
Maximum speed	75mph
Weight	26.3 tonnes
Engine(s)	Cummins LTA10-R (Originally Leyland TL11)
Safety system(s)	AWS, TPWS
Gauge	1435 mm (4 ft 8½ in)

The British Rail Class 143 is a diesel multiple unit, part of the Pacer family of trains introduced between 1985 & 1986. They originally worked around North East England but were later transferred to Wales. The coaches are based on an Alexander bus body mounted on a chassis from a freight or Goods truck.^[source?] Twenty-five units were built, numbered 143001-025 but later re-numbered 143601 - 143625.