British Rail Class 144
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.

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| British Rail Class 144 "Pacer" | |
|---|---|
|  Class 144, unit number 144017 at York railway station on 3rd June 2004. | |
| In service | 1986 - 2020 | 
| Manufacturer | BREL Derby and Walter Alexander | 
| Family name | Pacer | 
| Refurbishment | 2002 - 2004 - and 2010 2015 became 144e | 
| Number built | 23 | 
| Formation | DMS(+MS)+DMSL | 
| Operator(s) | Northern Rail first great Western | 
| Line(s) served | Harrogate Line, Huddersfield Line, Hallam Line, Pontefract Line, York & Selby Lines | 
| Specifications | |
| 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.
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