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Grovers bogie

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Grovers bogie


A wheelset is the wheel-axle assembly of a railroad car. The frame assembly beneath each end of a car, railcar or locomotive that holds the wheelsets is called the bogie (or truck in North America). Most North American freight cars have two bogies with two or three wheelsets, depending on the type of car; short freight cars generally have no bogies but instead have two wheelsets.

Grovers bogie

Two axle cars operating on lines with sharp curves, such as Queensland Railways, used Grovers bogies.

Special wheelsets

Rubber-tyred metros feature special wheelsets with rubber tires outside of the special flanged steel wheels. The unusually large flanges on the steel wheels guide the bogie through standard railroad switches and in addition keep the train from derailing in case the tires deflate.

Conical shape

Most wheels have a conical shape of about 1 in 20. The conical shape has the effect of steering the wheelset around curves, so that the flanges rarely come into play. The rails generally slant in at the same rate as the wheel conicity. As the wheels approach a curve, they will tend to follow a straighter path. This causes the wheelset to shift sideways on the track so that the effective diameter of the outer wheels is greater than that of the inner ones. Since the wheels are joined rigidly by the axle, the outer wheels will travel further, causing the train to naturally follow the curve.

For more information see Hunting oscillation.

For its first hundred years, Queensland Railways used cylindrical wheels and vertical rails.

Gallery

See also

References

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