The introduction of what became theClass 126 diesel multiple units originated in aBritish Transport Commission report of 1952 that suggested the trial use of diesel railcars. BR'sSwindon 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.

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