G&SWR 23 Class

The Glasgow and South Western Railway 23 class was a class of twenty 0-4-2 steam locomotives, the fourth 0-4-2 design that Patrick Stirling produced for the railway, designed in 1860. All twenty were built by Sharp, Stewart and Company between July 1860 and October 1862 and were numbered 22, 23, 24, 35, 37 and 116 to 130. They were fitted with domeless boilers with safety valves over the firebox, and after a boiler explosion at Springhill in 1876 these were replaced by safety valves of Ramsbottom design over the centre of the boiler, while the original weather boards gave way to Stirling cabs. Eight of the class were rebuilt as 0-4-2T tank engines between 1880 and 1886. Hugh Smellie withdrew the unrebuilt locomotives between 1882 and 1888, and the rebuilt ones were gone by 1904.