(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 | 1
3/4 | 1
1/4 | 1
3/4
|
Class 4 track | 1
1/2 | 1 | 1
1/2
|
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 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 | 1
1/4
|
Class 2 track
2 |
3 N/A | 1
1/4
|
Class 3 track |
3/4 | 1
1/4
|
Class 4 track |
3/4 |
7/8
|
Class 5 track |
1/2 |
5/8
|
[78 FR 16100, Mar. 13, 2013]