(a) Gage is measured between the heads of the rails at right-angles to the rails in a plane five-eighths of an inch below the top of the rail head.
(b) Gage shall be within the limits prescribed in the following table:
| Class of track
| The gage must be at least—
| But not more than—
| The change of gage within 31 feet must not be greater than—
|
|---|
| Class 6 track | 4′8″ | 4′9
1/4″ |
3/4″
|
| Class 7 track | 4′8″ | 4′9
1/4″ |
1/2″
|
| Class 8 track | 4′8″ | 4′9
1/4″ |
1/2″
|
| Class 9 track | 4′8
1/4″ | 4′9
1/4″ |
1/2″ |