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2. Rolling stock of the Kent & East Sussex Railway (heritage)

   en.wikipedia.org/wiki/Rolling_stock_of_the_Kent...

   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

3. Roller coaster wheel assembly - Wikipedia

   en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

   Side friction wheels: positioned on a horizontal plane, either inside or outside of the rails. These hug the sides of the rail, keeping the train centered. Up-stop wheels (also known as underfriction wheels or up-lift wheels): positioned under the rails to keep the train from lifting off of the track.

4. Train wheel - Wikipedia

   en.wikipedia.org/wiki/Train_wheel

   A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks. The wheel acts as a rolling component, typically press fitted onto an axle and mounted directly on a railway carriage or locomotive , or indirectly on a bogie (in the UK), also called a truck (in North America).

5. List of railroad truck parts - Wikipedia

   en.wikipedia.org/wiki/List_of_railroad_truck_parts

   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.

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7. Bay Area Rapid Transit rolling stock - Wikipedia

   en.wikipedia.org/wiki/Bay_Area_Rapid_Transit...

   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).