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A train has brakes similar to a car at every wheel (friction brakes), and also can use its locomotive power to apply a braking force (called dynamic braking). If any train wheels lock-up (stop moving) the sliding wheels do not slow the train as quickly as they are designed to do. In the US, modern locomotives use computerized braking systems, as do passenger trains. Freight cars are limited to the friction brakes and often this is where you may see a set of train wheels lock-up when they shouldn't.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoIt depends on three variables:
1. The weight of the train
2. The speed the train is travelling at
3. The effeective braking force of the train
Wiki User
∙ 15y agoAt any given speed, about 4 times as long as a truck or bus.
The limit is the coefficient of friction of steel on steel (.25) compared to rubber on asphalt (1).
Wiki User
∙ 11y agoThat depends on its mass, the track gradient and conditions, and the braking applied.
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