49 C.F.R. § 213.55

Current through September 30, 2024
Section 213.55 - Track alinement
(a) Except as provided in paragraph (b) of this section, alinement may not deviate from uniformity more than the amount prescribed in the following table:

Class of track Tangent trackCurved track
The deviation of the mid-offset from a 62-foot line1 may not be more than-(inches)The deviation of the mid-ordinate from a 31-foot chord2 may not be more than-(inches)The deviation of the mid-ordinate from a 62-foot chord2 may not be more than-(inches)
Class 1 track53 N/A5
Class 2 track33 N/A3
Class 3 track13/411/413/4
Class 4 track11/2111/2
Class 5 track3/41/25/8

1 The ends of the line shall be at points on the gage side of the line rail, five-eighths of an inch below the top of the railhead. Either rail may be used as the line rail; however, the same rail shall be used for the full length of that tangential segment of the track.

2 The ends of the chord shall be at points on the gage side of the outer rail, five-eighths of an inch below the top of the railhead.

3 N/A-Not Applicable

(b) For operations at a qualified cant deficiency, Eu, of more than 5 inches, the alinement of the outside rail of the curve may not deviate from uniformity more than the amount prescribed in the following table:

Class of trackCurved track
The deviation of the mid-ordinate from a 31-foot chord1 may not be more than-(inches)The deviation of the mid-ordinate from a 62-foot chord1 may not be more than-(inches)
Class 1 track23 N/A11/4
Class 2 track23 N/A11/4
Class 3 track3/411/4
Class 4 track3/47/8
Class 5 track1/25/8

1 The ends of the chord shall be at points on the gage side of the outer rail, five-eighths of an inch below the top of the railhead.

2 Restraining rails or other systems may be required for derailment prevention.

3 N/A-Not Applicable

49 C.F.R. §213.55

78 FR 16100, Mar. 13, 2013