Class 144 Pacer (Walter Alexander / BREL Derby Local & Secondary Services 2 and 3-car)

The Class 144 Pacer was a follow-on from the Class 143 sharing an almost identical Walter Alexander built body but with a chassis built by BREL Derby.

Number built: 56 (23 2 and 3-car sets)
Built: 1986-86
Builder: BREL Derby & Walter Alexander
Engine: Cummins LTA10-R diesel per car
Power: 450/675 hp (330/495 kW)
Formation: (2-car) Driving Motor Standard (DMS)+
Driving Motor Standard Lavatory (DMSL)
(3-car) DMS+Motor Standard (MS)+DMSL

The Class 144 was ordered for services in West Yorkshire [1]. To cope with an increase in passengers West Yorkshire PTE later ordered 10 extra Motor Standard trailers to augment 10 trains to 3-cars. These are the only vehicles in the large Pacer fleet to have no driving cabs. The Class 144 was originally built with Leyland TL11 engines but these were later replaced by Cummins diesels. The original transmission has also been replaced with a Voith diesel-hydraulic system [2].

As with the rest of the Pacer fleet the Class 144s face withdrawal by 2020. One Class 144 has been modified as the Class 144e (for Evolution) to meet future accessibility standards with an accessible toilet and a new interior/seating [3] however no others have been modified to to 144e and replacement stock has instead been ordered. All are currently operated by Northern.
Northern 144 020 at York

Compare the front of the 144 (right) to a 142

144 020 is a 3-car set
[1] Brian Haresnape, Diesel Multiple Units: The Second Generation and DEMUs (Ian Allan, 1986) p. 78
[2] Colin J. Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 127
[3] Colin J. Marsden, Rail Guide 2016 (Ian Allan, 2016) p. 91