The Oban line had numerous short but steep gradients along with tight curves and lightly constructed bridges, and was therefore a challenging route to operate.

McIntosh therefore designed a small 4-6-0 which was essentially an elongated hybrid of his 812 Class 0-6-0 and Dunalastair series 4-4-0 types.

Throughout their lives the locomotives were used primarily on the Oban line, although number 56 was on extended loan to the Highland Railway between 1916 and 1922.

[5] All were withdrawn and scrapped between 1928 and 1937, having been displaced from the Oban line by former Highland Railway Clan Class 4-6-0s.

source: BritishSteam[6] This article relating to steam locomotives operated in Scotland is a stub.