How do trains not derail on curves?

The outer rail is raised to tilt the train to the inside of the curve - this provides roll-over protection and at cruise speeds gravity helps keep the train more or less centered in the track. The wheels are tapered and 'steer' the bogies away from the rails, so on a curve the train is 'steered' around the bend.



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On curved sections, the longitudinal (traction or braking) forces between vehicles have a component inward or outward respectively on the curve. In extreme situations these lateral forces may be enough to produce derailment. A special case of train handling problems is overspeed on sharp curves.

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A damaged railway tire was the cause of the Eschede train disaster, when a tire failed on a high-speed ICE train, causing it to derail and killing 101 people.

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To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)

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While many of us change our car tires every 50,000 miles or so, Metro rail wheels can travel as far as 700,000 miles before they need to be replaced. Good thing because changing the wheels on a single rail car can take more than a week, depending on the design of the car.

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Unsourced material may be challenged and removed. Many passenger trains (usually medium and long-distance) have toilet facilities, often at the ends of carriages.

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A penny left on the tracks is too small to derail a train. Don't try this out, though, as many people have been killed in the attempt. Public domain image, source: U.S. Farm Security Administration.

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The accidents are often minor and rarely lead to death or injury, though some have led to major environmental disasters. About 1,000 derailments occur every year across the United States, according to the Federal Railroad Administration (FRA).

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There are about three train derailments per day. They usually aren't disasters The U.S. saw more than one thousand train derailments last year, but industry leaders say traveling by rail remains one of the safest methods of transportation.

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Moorpark derailment: Amtrak train carrying more than 200 people rams truck : NPR. Moorpark derailment: Amtrak train carrying more than 200 people rams truck Amtrak says the Coast Starlight train was carrying 198 passengers and 13 crew when it rammed into a public works truck on a raised gravel crossing.

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They aren't usually major disasters.

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The horn alerts people that a train is approaching a railroad crossing. It can also be used to warn animals or trespassers in our right-of-way along a section of track. Many people don't realize that federal and state regulations require us to sound the horn whenever we approach any crossing.

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All train crashes are tragic, but the Malbone Street Wreck is commonly considered the worst train crash in American history. On November 1, 1918, a packed Brighton Beach-bound train was speeding through a tunnel under Brooklyn's Malbone Street.

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