Pacer was the operational name of the British Rail Classes 140, 141, 142, 143 and 144 diesel multiple unit railbuses, built between 1980 and 1987. They were inexpensively developed using a passenger body based on the Leyland National bus on top of a chassis based on the HSFV1 research vehicle. The railbuses were intended as a short-term solution to a shortage of rolling stock, with a lifespan of no more than 20 years. As modernised replacements were lacking, the Pacer fleet remained in service on some lines until 2021 – 37 years after their introduction in 1984.
A Class 142 and Class 143 at Exeter St Davids in 2011
Some Pacers were based on the Leyland National bus
The bus style bench seating originally used on a Class 144 Pacer
The prototype Pacer Class 140
The British Rail Class 140 was the prototype of the Pacer diesel multiple unit.
Class 140 (right) at Landore TMD, Swansea, in 1982
140001 at Shrewsbury between driver training runs on the Central Wales line on 4 December 1981.