49 CFR 213.331 - Track surface.

§ 213.331 Track surface.
(a) For a single deviation in track surface, each owner of the track to which this subpart applies shall maintain the surface of its track within the limits prescribed in the following table:
Track surface Class of track
6 (inches) 7 (inches) 8 (inches) 9 (inches)
1 Uniformity for profile is established by placing the midpoint of the specified chord at the point of maximum measurement.
2 However, to control harmonics on jointed track with staggered joints, the crosslevel differences shall not exceed 11/4 inches in all of six consecutive pairs of joints, as created by 7 joints. Track with joints staggered less than 10 feet shall not be considered as having staggered joints. Joints within the 7 low joints outside of the regular joint spacing shall not be considered as joints for purposes of this footnote.
The deviation from uniform 1 profile on either rail at the midordinate of a 31-foot chord may not be more than 1 1 3/4 1/2
The deviation from uniform profile on either rail at the midordinate of a 62-foot chord may not be more than 1 1 1 3/4
The deviation from uniform profile on either rail at the midordinate of a 124-foot chord may not be more than 13/4 11/2 11/4 11/4
The difference in crosslevel between any two points less than 62 feet apart may not be more than 2 11/2 11/2 11/2 11/2
(b) For three or more non-overlapping deviations in track surface occurring within a distance equal to five times the specified chord length, each of which exceeds the limits in the following table, each owner of the track to which this subpart applies shall maintain the surface of the track within the limits prescribed for each deviation:
Track surface Class of track
6 (inches) 7 (inches) 8 (inches) 9 (inches)
The deviation from uniform profile on either rail at the midordinate of a 31-foot chord may not be more than 3/4 3/4 1/2 3/8
The deviation from uniform profile on either rail at the midordinate of a 62-foot chord may not be more than 3/4 3/4 3/4 1/2
The deviation from uniform profile on either rail at the midordinate of a 124-foot chord may not be more than 11/4 1 7/8 7/8

Title 49 published on 2014-10-01

no entries appear in the Federal Register after this date.

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