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Train wheels are not perfectly cylindrical but slightly conical, which is an engineering marvel. This conical shape achieves two main functions: it corrects the train's course towards the center and facilitates differential action. An experiment with glued paper cups illustrates this; when rolled on tracks, cups can remain straight even when tilted initially, but those glued in the opposite direction fail. Railway wheels, with their conical shape, ensure that wheels remain on the track. This design produces a self-centering force, essential for maintaining stability during straight track movement. Understanding the forces acting on the wheels is crucial for this function.