§ 213.65 — Combined Track Alinement And Surface Deviations

On any curved track where operations are conducted at a qualified cant deficiency, Eu, greater than 5 inches, the combination of alinement and surface deviations for the same chord length on the outside rail in the curve, as measured by a TGMS, shall comply with the following formula:

Where—

Am = measured alinement deviation from uniformity (outward is positive, inward is negative).

AL = allowable alinement limit as per § 213.55(b) (always positive) for the class of track.

Sm = measured profile deviation from uniformity (down is positive, up is negative).

SL = allowable profile limit as per § 213.63(b) (always positive) for the class of track.