How can trains move on rails? if the wheels are smooth and the rails are also smooth, how can it be enough friction for it to move?

Question

How can trains move on rails? if the wheels are smooth and the rails are also smooth, how can it be enough friction for it to move?

In: 2785

Answer 1

There’s even less contact than you might think because the wheels are not flat to the rail, but rather are at an angle.

Each wheel tapers in slightly towards the center. It what keeps the wheels on the track and also allows the solid axle wheels to negotiate curves.