How and why wheels stay on track?

Wheels stay on track due to the design of the track and the wheel's shape, typically featuring a flange that helps guide the wheel along the rail. The track provides a defined path, while the flange prevents lateral movement, ensuring stability and adherence to the intended route. This system is crucial for vehicles like trains, as it allows for smooth and safe navigation at various speeds. Additionally, the weight distribution and mechanical properties of the vehicle contribute to maintaining contact with the track.