The Garlieston branch, together with the rest of the Wigtownshire Railway, closed completely in 1964.

The branch opened from Millisle to Garlieston on 3 April 1876 for both goods and passengers.

[1] However, Garlieston had a good harbour and it occasionally ran boat excursions to the Isle of Man.

[2] These were well patronised, so the railway continued to provide excursion trains to Garlieston until 1935.

By the 1960s, these services ran three days per week; with conditional working on the Garlieston branch, when required.