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It's the contact surface. The locomotive and train wheels only touch the rail so much. The actual space taken up by the wheel of the train is about the size of a dime. Now, each wheel does add up, but the train's huge volume and fast speed and momentum, it all adds up. That's why tanks stop fast, and trains don't. Tanks have a lot of their track touching the ground, while train's have the space of a dime a wheel touching the rail.

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12y ago
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Q: What makes a moving freight train difficult to stop?
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