British Rail Class 144

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British Rail Class 144 "Pacer"
144017 at York.JPG
Class 144, unit number 144017 at York railway station on 3rd June 2004.
In service 1986 - present
Manufacturer BREL Derby and Walter Alexander
Family name Pacer
Refurbishment 2003 - 2004 - 2008?
Number built 23
Formation DMS(+MS)+DMSL
Operator(s) Northern Rail
Line(s) served Harrogate Line, Huddersfield Line, Hallam Line, Pontefract Line, York & Selby Lines
Maximum speed 75MPH
Prime mover(s) Cummins LTA10-R (Originally Leyland TL11)
Safety system(s) AWS, TPWS
Track gauge 1435 mm (4 ft 8½ in)
144023 at Leeds City Station.

The British Rail Class 144 "Pacer" diesel multiple units (DMUs) were built by BREL Derby from 1986-1987. A total of 23 units were built, replacing many of the earlier First-generation "Heritage" DMUs.