49 CFR §213.65
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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: