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- Small Bloomer 2-2-2 Locomotive Class
- In 1834 the ‘ Small Bloomer’ were introduced. The were basically similar to the ‘Large Bloomer’ but had smaller boiler and smaller driving wheels 6ft 6in, instead of 7ft. See also Extra Large Bloomer, Large Bloomer, and Bloomer.
- Small Jumbo 2-4-0 Locomotive Class
- Ramsbottom’s Samson class engines were replaced in the 1890s by engines which were outwardly of similar appearance to the ‘Improved Precedents’ or ‘Jumbos’ which had been introduced by Webb in 1887. The replaced Samsons had smaller 6ft driving wheels and were thus colloquially known as the ‘Small Jumbos’. Small Jumbos were also sometimes known as ‘Whitworth’ or ‘Waterloo’ class, after early members of the class.
- Smoke Box
- A cylindrical drum on the front of a steam-locomotive boiler, into which the hot gases from the boiler tubes pass. By routing the exhaust steam from the cylinders through a blast pipe within the smoke-box and directing the resulting jet out the chimney a partial vacuum is created in the smoke-box, and by making it as large as possible a more even draught is created over the area of the tubes. This vacuum draws the hot gases from the fire through the boiler tubes thus heating the boiler water more rapidly and producing more steam to replace that used.
- Smoke Box Door
- An opening at the front of the smokebox to allow access for the removal of ash drawn through the boiler tubes from the fire. The door must be kept air tight to ensure that the maximum draught is available to allow air to be drawn through the fire from the grate.
- Snifting Valve
- Snow Plough
- A reinforced wagon with a low pointed device to cut through heavy snow. Coupled in front of a locomotive, it forced the snow from the line, allowing other trains to pass.
- Longitudinal members of coach or wagon frame , formerly of wood, but nowadays of steel, to which are fixed the horn plates or axle guards.
- Somersault Signal
- A semaphore signal (common on the Great Northern Railway[rNR]), in which the arm was pivoted centrally and was vertical at ‘off’.
- Sorting Van
- See Parcels Van.
- The needles of a Telegraph machine were provided with metal stops that enabled the Signalmen to hear the message, rather that having to see the message on the indicating needles.
- Southern Division
- One of the three divisions set up when the LNWR was formed on 16th July 1846, the others being the North Eastern Division and the Northern Division. All three had their own operating methods and workshops for locomotive etc., those of the Southern Division being at Wolverton and Euston. The area administered by the Southern Division was primarily the old L&BRly and branches, eventually all lines south of Stafford. The Northern and Southern Division locomotive departments were merged in 1862 (the North Eastern Division having been amalgamated into the Northern Division in 1857) but much of the administration remained separate until formation of the LMS in 1923.