(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 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 track | 5 | 3N/A | 5 |
| Class 2 track | 3 | 3N/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 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 track2 | 3N/A | 11⁄4 |
| Class 2 track2 | 3N/A | 11⁄4 |
| Class 3 track | 3⁄4 | 11⁄4 |
| Class 4 track | 3⁄4 | 7⁄8 |
| Class 5 track | 1⁄2 | 5⁄8 |
1The 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.
2Restraining rails or other systems may be required for derailment prevention.
3N/A—Not Applicable
[78 FR 16100, Mar. 13, 2013]
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