On 22 May 1915, a 213 yard long troop train was telescoped down to 67 yards, a third of its original length, when it was involved in a triple collision at Quintinshill, north east of Gretna, Dumfriesshire. The troop train ran into a train which had accidentally been left on the line, and a few seconds later an express from London, travelling in the opposite direction, crashed into the wreckage.
Of the 500 troops on the train, only 53 answered the roll call after the accident. 227 people were killed in total, including 3 officers, 29 NCOs, and 182 men of the 1/7th Royal Scots who were on their way to Gallipoli. On this one day, whilst still within the UK, the battalion suffered 42% of its total casualties for the whole of the War.