01-01-2011, 08:41 PM
Here are the actual tables from 49 CFR. I found over years of watching wheel sets in curves that widening the gauge on curves is not needed, in fact, you can drop in easier on a curve than on tangent track. A wheel set doesn't go around a curve evenly, they tend to skew which in fact makes the wheel set width narrower. The trouble with super elevations and freight trains is they have to maintain track speed or the weight does go to the low rail and it will look like a washboard if this happens frequently.
Charlie
Charlie