Just in case you figure out more, there is this entry in 1901:
James Kirk 23 railway guard, b. Maxwelltown, Kirkcudbrightshire
Isabella Kirk 22 b. Maxwelltown, Kirkcudbrightshire
James Kirk 3 Months b. Maxwelltown, Kirkcudbrightshire
Address: 66 College St, Troqueer, Kirkcudbrightshire
Monica