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Electronic Code of Federal Regulations

e-CFR data is current as of December 4, 2019

Title 49Subtitle BChapter IIPart 213Subpart C → §213.63


Title 49: Transportation
PART 213—TRACK SAFETY STANDARDS
Subpart C—Track Geometry


§213.63   Track surface.

(a) Except as provided in paragraph (b) of this section, each track owner shall maintain the surface of its track within the limits prescribed in the following table:

Track surface (inches)Class of track
12345
The runoff in any 31 feet of rail at the end of a raise may not be more than312 32112 1
The deviation from uniform profile on either rail at the mid-ordinate of a 62-foot chord may not be more than3234 214 2114
The deviation from zero crosslevel at any point on tangent or reverse crosslevel elevation on curves may not be more than32134 114 1
The difference in crosslevel between any two points less than 62 feet apart may not be more than* 1 23214 2134 112
*Where determined by engineering decision prior to June 22, 1998, due to physical restrictions on spiral length and operating practices and experience, the variation in crosslevel on spirals per 31 feet may not be more than2134 114 1 34

1Except as limited by §213.57(a), where the elevation at any point in a curve equals or exceeds 6 inches, the difference in crosslevel within 62 feet between that point and a point with greater elevation may not be more than 112 inches.

2However, to control harmonics on Class 2 through 5 jointed track with staggered joints, the crosslevel differences shall not exceed 114 inches in all of six consecutive pairs of joints, as created by seven low joints. Track with joints staggered less than 10 feet apart shall not be considered as having staggered joints. Joints within the seven low joints outside of the regular joint spacing shall not be considered as joints for purposes of this footnote.

(b) For operations at a qualified cant deficiency, Eu, of more than 5 inches, each track owner shall maintain the surface of the curve within the limits prescribed in the following table:

Track surface (inches)Class of track
12345
The deviation from uniform profile on either rail at the mid-ordinate of a 31-foot chord may not be more thanN/A1N/A1111
The deviation from uniform profile on either rail at the mid-ordinate of a 62-foot chord may not be more than214 214 134 114 1
The difference in crosslevel between any two points less than 10 feet apart (short warp) shall not be more than22134 134 112

1N/A—Not Applicable.

[78 FR 16101, Mar. 13, 2013]

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