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2. 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.

3. Wheelset (rail transport) - Wikipedia

   en.wikipedia.org/wiki/Wheelset_(rail_transport)

   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.

4. Adhesion railway - Wikipedia

   en.wikipedia.org/wiki/Adhesion_railway

   Together with some moisture on the track, which acts as a light adhesive and keeps the applied sand on the track, the wheels "bake" the crushed sand into a more solid layer of sand. Because the sand is applied to the first wheels on the locomotive, the following wheels may run, at least partially and for a limited time, on a layer of sand ...

5. 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).

6. GateKeeper (roller coaster) - Wikipedia

   en.wikipedia.org/wiki/GateKeeper_(roller_coaster)

   GateKeeper's tubular steel track is 4,164 feet (1,269 m) long and the lift is approximately 170 feet (52 m) high. The track is Azure Blue (dark blue) and Strata Blue (light blue), and the supports are white. [41] There are 102 track pieces, each weighing approximately 7,500 pounds (3,400 kg).

7. History of the railway track - Wikipedia

   en.wikipedia.org/wiki/History_of_the_railway_track

   Train wheels rolling over the spikes loosened them, allowing the rail to break free and curve upwards sufficiently that a car wheel could get beneath it and force the end of the rail up through the floor of the car, writhing and twisting, endangering passengers. These broken rails became known as "snake heads". [14]