Caledonian Railway 191 Class

The Caledonian Railway 191 Class were 4-6-0 passenger engines designed by William Pickersgill and built in 1922 by the North British Locomotive Company. The class was meant for the Callander and Oban line, to supplement the 55 Class 4-6-0s and replace elderly 179 Class 4-4-0s, and the engines were therefore known as the New Oban Bogies, although they also worked other Caledonian lines. They were not completely successful: they had a reputation for being short of steam unless skillfully fired, the lack of superheating was a curious omission for a type introduced as late as 1922, and they carried the highest total locomotive hammerblow of any class the London, Midland and Scottish Railway inherited at its formation in 1923. All were withdrawn and scrapped between 1939 and 1945, displaced by new Black Five 4-6-0s.