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over its main line between Glasgow and Carlisle required to be double headed, even in the less demanding southbound ('up') direction. Northbound ('down') trains also required banking assistance on the climb to Beattock Summit. In an effort to avoid these requirements, McIntosh designed a large 4-6-0 based on his 'Dunalastair' series of 4-4-0s. Two locomotives were built in

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