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The conical shape of train wheels is a remarkable engineering design that serves two primary functions: correcting the train's course towards the center and enabling differential action. An experiment with glued paper cups illustrates this concept; when rolled correctly, the cups remain on track even when tilted, while opposite arrangements fail. The conical shape ensures that wheels stay aligned on the track, producing a self-centering force that keeps the train stable. This effectiveness in guiding the train can be further understood by examining the forces acting on the wheels during straight movement.