During the First World War Colsterdale was the site of a training camp for the Leeds Pals.
The narrow-gauge Colsterdale Waterworks Light Railway built in 1901 as a supply line from Masham to Roundhill Reservoir closed in 1926 and was removed in 1932 (after being used during World War I for troop transport to the Leeds Pals camp at Breary Banks just north of Leighton) but is still evident on the south side of the dale.
The battalion was formed in September 1914 and underwent training at Colsterdale in the Yorkshire Dales.
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