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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.[2] The class featured a particularly short driving-wheel wheelbase to cope with the curvature of the line, and short tenders to enable the locomotives to fit onto the existing small turntable at Oban shed. The subsequent 918 Class was very similar to the 55 Class, but had a larger boiler and tender for express goods services on the mainline.
The locomotives were built in two batches. Numbers 55-59 were built in 1902, whilst numbers 51-54 were built to a slightly modified design in 1905. 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.[3]
The locomotives passed to the LMS upon its formation in 1923, and were renumbered 14600-14608 (ex 55-59, 51-54).[4] The LMS rebuilt two locomotives (14606 and 14607) with larger boilers from withdrawn 918 Class engines in 1930.[5] All were withdrawn and scrapped between 1928 and 1937, having been displaced from the Oban line by former Highland Railway Clan Class 4-6-0s.
123456Atkins, C. P. (1976), The Scottish 4-6-0 Classes, Ian Allan, p.103
↑Atkins, C. P. (1976), The Scottish 4-6-0 Classes, Ian Allan, p.45
↑Atkins, C. P. (1976), The Scottish 4-6-0 Classes, Ian Allan, p.46
↑Casserley, H. C. & Johnston, S. W. (1986), Locomotives at the Grouping 3: London Midland and Scottish, Ian Allan
↑Essery, Bob & Jenkinson, David (1966), An illustrated History of L.M.S. Locomotives Volume Three: Absorbed Pre-Group Classes, Northern Division, Oxford Publishing Co.
