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The difference between the distances travelled by each wheel for each rotation of the axle causes the wheelset to follow the curve of the track. [4] Almost all train wheels have a projection, called a flange, on one side to keep the wheels, and hence the train, running on the rails when the limits or tests of alignment are reached: when a bend ...
Rail vehicle wheels are usually mounted on a solid axle, so they turn at the same speed.When a vehicle turns the outer wheel has to travel further than the inner wheel. On a road vehicle, this is usually achieved by allowing the wheels to move independently, and fixing the front wheels in an arrangement known as Ackermann steering geometry.
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.
However, if the degree of conicality is inappropriate for the suspension and track, an unpleasant oscillation can occur at high speeds. Recent research is also showing that marginal changes to wheel and rail profiles can improve performance further. [2] Not all railroads have employed conical-tread wheels.
Section of timber track from a 16th-century gold mine in Transylvania.The wagons were guided by the pronounced flange on the wooden wheels, and the narrow gauge of 480 mm (18 + 7 ⁄ 8 in) allowed the points to be altered by swinging the single switch rail. [1]
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In May 1967, Lionel Corporation announced it had purchased the American Flyer name and tooling even though it was teetering on the brink of financial failure itself. A May 29, 1967, story in The Wall Street Journal made light of the deal, stating, "Two of the best-known railroads in the nation are merging and the Interstate Commerce Commission couldn't care less".
Centering is actually accomplished through shaping of the wheel. The tread of the wheel is slightly tapered. When the train is in the centre of the track, the region of the wheels in contact with the rail traces out a circle which has the same diameter for both wheels. The velocities of the two wheels are equal, so the train moves in a straight ...