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A wheelset is a pair of railroad vehicle wheels mounted rigidly on an axle allowing both wheels to rotate together. Wheelsets are often mounted in a bogie (" truck " in North America ) – a pivoted frame assembly holding at least two wheelsets – at each end of the vehicle.
Railroad car wheels are fixed rigidly to their axle, ensuring both wheels of the wheelset rotate at the same rate.. A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks.
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.
Bogies allow the wheelsets to more closely follow the direction of the rails when travelling around a curve in the railroad. Displacements of a bogie. Bogies serve a number of purposes: [6] Support of the rail vehicle body; Stability on both straight and curved track
Locomotives of different types (Whyte and UIC wheel notation) In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. [1]
If initially the wheelset is centered on the railroad track then the effective diameters of each wheel are the same and the wheelset rolls down the track in a perfectly straight line forever. But if the wheelset is a little off-center so that the effective diameters (or radii) are different, then the wheelset starts to move in a curve of radius ...
The primary reason that the original RoadRailer concept was not viable was the weight penalty imposed on the trailers because of the attached railroad wheelset. This was resolved in later designs which removed the integrated wheelset by having a dedicated rail bogie assembly that stayed in the rail yard, as seen today. [citation needed] [9]
A selection of early 20th century locomotive types according to their Whyte notation and their comparative size Whyte notation from a handbook for railroad industry workers published in 1906 [1] The Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel ...