# Thread: Train Wheels

1. I was stopped at a railway crossing the other day and as I waited the railway cars passed by. One of them was an open flatcar carrying train wheels. Now when I looked at these wheels they appear to be one solid steel axle with matching steel wheels at each end. I got to wondering just how a train equipped with these wheel sets actually works when rounding a curve in the tracks. I would think that the outer wheel would have farther to travel than the inner. How does it do it without creating some type of drag or skidding?

All I know is what a friend told me, the bevelled shape of the wheel actually allows the wheels or car to shift sideways enough to permit smoother cornering. Is this true?

2.

3. Yes. The wheels are conical so that the outside is larger than the inside. Therefore as the outer wheel shifts toward the outside of the curve, its rolling radius is increased so the outside wheel travels farther than the inside wheel, per each revolution of the common axle.

4. Originally Posted by Harold14370
Yes. The wheels are conical so that the outside is larger than the inside. Therefore as the outer wheel shifts toward the outside of the curve, its rolling radius is increased so the outside wheel travels farther than the inside wheel, per each revolution of the common axle.