eli5 Why do trains with steel wheels have traction on steel rails, but if your brakes on your car are used up and become steel on steel they dont work anymore?

Question

eli5 Why do trains with steel wheels have traction on steel rails, but if your brakes on your car are used up and become steel on steel they dont work anymore?

In: 1231

Answer 1

Practical Engineering just put out a video on these topics a few days ago. https://www.youtube.com/watch?v=Nteyw40i9So