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?
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Trains have very little traction. With them it’s more a case of reducing friction and making them more efficient. They don’t really need traction so much as they don’t have many turns and their behaviour is very predictable.
Look up some videos of trains going up hills. They start slipping on the tiniest of slopes.
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