NCC Class S1
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The Northern Counties Committee (NCC) Class S1 was a class of two-cylinder compound 2-4-2T steam locomotives that was introduced for service on the 3 ft (910 mm) narrow gauge railways of County Antrim in north-east Ireland. The members of the class were rebuilds of the BNCR Class S.
The Class S1 was a class of two locomotives that were rebuilt by the LMS (NCC) from BNCR Class S Worsdell-von Borries two-cylinder compound locomotives. They had outside cylinders and Walschaerts valve gear with the smaller diameter high-pressure cylinder on the left and the larger low-pressure one on the right.
The rebuilding was carried out to increase the coal capacity by fitting a bunker behind the cab. This was accommodated by increasing the length of the radial truck, the wheelbase and overall length of the locomotives by two feet. On the modified engines the coal capacity was nominally unaltered at one long ton but the bunker enabled their footplates to be kept free from coal and improved working conditions in the rather cramped cabs. The weight was increased by 1 long ton 3 cwt (2,600 lb or 1.2 t).
No.101 (ex-113) was rebuilt as Class S1 in 1928 and No.102 (ex-112) was rebuilt in 1930.
No.101 was renumbered No.41 in June 1939 and spent most of its later career on the Ballycastle line. During the harsh winter of 1947, No.41 famously became stuck in a snow drift between Capecastle and Armoy while working the afternoon up train to Ballymena on 12 March. Passengers and train crew spent the night in the guard's van (which had a stove) and while the passengers were rescued by a relief train on the following day, it was not until two days later that No.41 and her train were finally freed from the snow drifts.
No.102 also worked for a while on the Ballycastle line before spending its last years working between Larne and Ballyclare paper mill. It was renumbered No.42 in March 1942. Nos 41 and 42 were scrapped in February 1954.