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49 U.S.C. 20102-20114 and 20142; 28 U.S.C. 2461 note; and 49 CFR 1.89.
63 FR 34029, June 22, 1998, unless otherwise noted.
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(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 track | Curved track | ||
|---|---|---|---|---|
| The deviation of the mid-offset from a 62-foot line 1 may not be more than—(inches) | The deviation of the mid-ordinate from a 31-foot chord 2 may not be more than—(inches) | The deviation of the mid-ordinate from a 62-foot chord 2 may not be more than—(inches) | ||
| Class 1 track | 5 | 3 N/A | 5 | |
| Class 2 track | 3 | 3 N/A | 3 | |
| Class 3 track | 13⁄4 | 11⁄4 | 13⁄4 | |
| Class 4 track | 11⁄2 | 1 | 11⁄2 | |
| Class 5 track | 3⁄4 | 1⁄2 | 5⁄8 | |
| 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 track | Curved track | ||
|---|---|---|---|
| The deviation of the mid-ordinate from a 31-foot chord 1 may not be more than—(inches) | The deviation of the mid-ordinate from a 62-foot chord 1 may not be more than—(inches) | ||
| Class 1 track 2 | 3 N/A | 11⁄4 | |
| Class 2 track 2 | 3 N/A | 11⁄4 | |
| Class 3 track | 3⁄4 | 11⁄4 | |
| Class 4 track | 3⁄4 | 7⁄8 | |
| Class 5 track | 1⁄2 | 5⁄8 | |
| 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 | |||
[78 FR 16100, Mar. 13, 2013]