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Sandbox (locomotive)
A sandbox is a container on most locomotives, multiple units and trams that holds sand, which is dropped on the rail in front of the driving wheels in wet and slippery conditions and on steep grades in order to improve traction.
==Sand delivery==
The sand may be delivered by gravity, by a steam-blast (steam locomotives) or by compressed air. Gravity sanding requires that the sand be dry so that it runs freely. Locomotives used multiple sandboxes, so that their delivery pipes could be short and near-vertical. Engine sheds in the UK were equipped with sand drying stoves, so that sandboxes could be refilled each morning with dry sand. Steam locomotives in the USA had a single sandbox, called a sand dome on top of the boiler where the rising heat helped to dry the sand. Even with this arrangement, sand pipes tended to clog, and by the 1880s, pneumatic sanding systems were being proposed.〔John B. Collin, Sanding Device for Locomotives, (U.S. Patent 271,039 ), Jan 23, 1883.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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