49 CFR 213.332 – Combined track alinement and surface deviations
(a) This section applies to any curved track where operations are conducted at a qualified cant deficiency, E
(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: