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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Another difference: your brake pads slide across the discs. When a train slows down, the wheels don’t slide over the tracks, so the friction is greater. If the wheels slide deceleration is reduced, just like on your car or bike. When a train slows down, the wheels are charging a battery.
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