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

Just the locomotive (the engine car) weighs close to ½ million pounds. Even if the wheels and rails were polished mirror smooth, there’s still friction