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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.
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]
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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.
The small rail wheels fitted to road–rail vehicles allow them to be stowed away when the vehicle is in road-going mode. Wheels used for road–rail vehicles are normally smaller than those found on other types of rolling stock, such as locomotives or carriages, because the wheel has to be stowed clear of the ground when the vehicle is in road-going mode.
The Pennsylvania Railroad originally used 4 ft 9 in (1,448 mm) The trams in Dresden , authorised in 1872 as horsecars , used 1,440 mm ( 4 ft 8 + 11 ⁄ 16 in ) gauge vehicles. Converted to 600 V DC electric trams in 1893, they now use 1,450 mm ( 4 ft 9 + 3 ⁄ 32 in ); both gauges are within the tolerance for standard gauge.
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 ...