49 CFR § 213.65 - Combined track alinement and surface deviations.
---
identifier: "/us/cfr/t49/s213.65"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 213.65 - Combined track alinement and surface deviations."
title_number: 49
title_name: "Transportation"
section_number: "213.65"
section_name: "Combined track alinement and surface deviations."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "213"
part_name: "TRACK SAFETY STANDARDS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20102-20114 and 20142; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "63 FR 34029, June 22, 1998, unless otherwise noted."
cfr_part: "213"
---
# 213.65 Combined track alinement and surface deviations.
On any curved track where operations are conducted at a qualified cant deficiency, E<sub>u</sub>, 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—
A<sub>m</sub> = measured alinement deviation from uniformity (outward is positive, inward is negative).
A<sub>L</sub> = allowable alinement limit as per § 213.55(b) (always positive) for the class of track.
S<sub>m</sub> = measured profile deviation from uniformity (down is positive, up is negative).
S<sub>L</sub> = allowable profile limit as per § 213.63(b) (always positive) for the class of track.
[78 FR 16102, Mar. 13, 2013]