|British Rail Class 126|
|Manufacturer||BR Swindon Works|
|Car length||64 ft 6 in|
|Width||9 ft 3 in|
|Height||12 ft 9 1/2 in|
|Maximum speed||70 mph (112 km/h)|
|Prime mover(s)||BUT (AEC) 150 hp|
The introduction of what became the Class 126 diesel multiple units originated in a British Transport Commission report of 1952 that suggested the trial use of diesel railcars. BR's Swindon Works were chosen to design and build express units for the ex-North British Railway Edinburgh Waverley to Glasgow Queen Street route. Swindon built a second batch in 1959/60 for use on services from Glasgow to Ayrshire.