## Question: Reddit Why Train Wheels Have Conical Geometry?

This is because very precise design of the rail curves which – unlike roads – must always be spiral curves with very precise geometry because a train cannot shift during the turn.

## Why are train wheels conical?

The wheels on each side of a train car are connected with a metal rod called an axle. This is where the wheels’ geometry comes in. 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.

## Why train wheels are tapered?

The taper of the wheel rims keeps a train on its tracks, not the flanges. But if an emergency occurs, you’ll be glad the flanges are present.

## Do train wheels rotate?

Train wheels aren’t perfect cylinders. They’re beveled to make them wider on the inside. This means that when the train shifts left or right on the track, the diameter of the wheels can change. But because the wheels are connected by an axle, they still spin at the same rate.

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## What is the diameter of a train wheel?

The 3D shape of the wheel was scanned, and the diameter was calculated as 799.87 mm.

## How does a train turn without differential?

The train doesn’t take sharp turns hence there is no need to provide a differntial in train. Anyways the differential cannot be applied to the train wheel because the right wheel and left wheel are connected with each other by a rigid axle. The wheels of the train are tapered or cone shaped.

## How much of a train wheel touches the track?

The only part of a train wheel that actually touches the rail is around the size of a 10 cent/20pence coin.

## Why does a maglev move so fast?

Maglev trains float on a cushion of air, eliminating friction. This lack of friction and the trains’ aerodynamic designs allow these trains to reach unprecedented ground transportation speeds of more than 310 mph (500 kph), or twice as fast as Amtrak’s fastest commuter train [source: Boslaugh].

## Do locomotives still use sand?

The heaviest trains require the highest friction and the heaviest locomotive. The friction can vary a great deal, but it was known on early railways that sand helped, and it is still used today, even on locomotives with modern traction controls.

• Adhesion is the ratio of drawbar force to locomotive weight. • The “dispatchable adhesion” is the overall adhesion rating. – a measure of how much a locomotive can pull. – to determine how many locomotives will be necessary to pull a specific train over a specific section of railroad.

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## Why are train wheels made of steel?

The Steel Interstate Coalition says that a steel wheel in contact with a steel rail can reduce ground friction by 85-99%. Rail represents the most efficient mode because of this significant reduction in ground friction.

## What is the objective of coning of wheels?

Coning of wheels helps the outer wheel to travel a longer distance than inner wheel. Explanation: When the locomotive travels a curve centrifugal force acts on it. Due to this the outer wheel moves outwards and has to travel longer distance as compared to the inner wheel. Thus coning of wheels is done.

## Can trains go uphill?

As mentioned in my short answer, trains can definitely go uphill, however the way trains work, are making any gradients greater than 2% quite hard to climb. There are few reasons why trains don’t perform well uphill, the main one however is the force of gravitation.

## Can a coin on the track derail a train?

A penny left on a track does not typically derail a train. A train speeding along its track is a very heavy object with an immense amount of momentum. The penny is simply too light to do much of anything. A car, truck, or even a brick left on the track can lead to derailment.

## Do bullet trains have wheels?

Commuting on a maglev bullet train, known in Japan as shinkansen, that can reach speeds of 375 mph? As the train leaves the station, it’s rolling on wheels. But as it speeds up, the wheels retract, and the power of magnets allows the vehicle to hover four inches above the ground.

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## How heavy is a train wheel?

This ensures that they rotate at the same time together on the train tracks. An individual wheel that is not attached to an axle and another wheel weighs between 800 and 900 pounds (362 to 408 kg), while a wheelset weighs in at over 2,000 pounds (907 kg).