The British Rail Class 141 was the first production model of the Pacer diesel multiple unit (DMU) railbus. During the 1980s, British Rail (BR) was interested in replacing its first generation diesel multiple units, particularly in the use of railbuses to service its lightly used branch lines. It was decided to develop such a vehicle with a high level of commonality with the widely used Leyland National bus, leading to its modular design serving as the basis for the design. Several single and two-car prototypes were constructed and evaluated, before an order was placed with British Leyland for twenty two-car Class 141 units during 1984. During their operating lives, the type was tasked with various passenger services across the UK for 13 years; a large portion of the withdrawn units were su