This is the equation for friction:
>f = u N
>
>f = The force of friction
>
>u = The coefficent of friction
>
>N = the Normal force (for this conversation: how heavy it is)
You’re right, round metal wheels on flat metal bars has a pretty low coefficent of friction. However trains are fucking giant and heavy. That means they both have a high Normal force, and also don’t need that much friction since they accelerate/decelerate slowly due to high inertia.
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