(a) This section applies to any curved track where operations are conducted at a qualified cant deficiency, Eu, greater than 5 inches, and to all Class 9 track, either curved or tangent.
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(b) For the conditions defined in paragraph (a) of this section, the combination of alinement and surface deviations for the same chord length on the outside rail in a curve and on any of the two rails of a tangent section, 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 § 213.327(c) (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 § 213.331(a) and § 213.331(b) (always positive) for the class of track.[78 FR 16107, Mar. 13, 2013]