(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 | 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 |
(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 | 3 N/A | 11⁄4 |
| Class 2 track2 | 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 |
[78 FR 16100, Mar. 13, 2013]