High Quality Content by WIKIPEDIA articles! 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/1.2 t).

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