Beating the issues!

Two main forces act on a super elevated curve: the overbalance, a static or dynamic condition which the resultant force is less than equilibrium speed.

And the unbalance, on the opposite direction of the first, and occurs due to a dynamic condition which the resultant force exceeds equilibrium speed.

To determine the unbalance the following formula can be used:

Vmax = √ ((Ea + U)/.0007D)

where: Vmax = Velocity of train (maximum allowed speed in MPH)

Ea = Actual Elevation (inches)

U = Unbalance (inches)

D = Degree of Curvature (decimal degrees)


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