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An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
They often consist of at least 3 wheels per assembly, but can contain more. The typical arrangement of the wheels are: Running wheels (also known as road wheels or tractor wheels): positioned on the top of the rail, bearing the weight of the train. Side friction wheels: positioned on a horizontal plane, either inside or outside of the rails ...
6-wheel Third Built in 1899 at Longhedge Works as a five compartment 6-wheel Third as a replacement for the original 91. Later numbered 3045 (SECR, 1905) and 1666 (SR, 1926). A medium- to long-term restoration project. Will be restored as a 4 wheeler. Number 66 in the K&ESR stocklist. [31] London, Chatham and Dover Railway: 91 4-wheel Third
A railway track (CwthE and UIC terminology) or railroad track (NAmE), also known as permanent way (CwthE) [1] or "P Way" (BrE [2] and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers (railroad ties in American English) and ballast (or slab track), plus the underlying subgrade.
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Pairs of wheels are attached to one another with an axle such that they must have the same rotational speed, but on a curve the distances the outer and inner wheels travel are different. As a result, the wheels must slip along the rails. This slippage causes the wheel and track to wear and become uneven (corrugated).