(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—
|
|---|
| Excepted track | N/A | 4′10
1/4″.
|
| Class 1 track | 4′8″ | 4′10″.
|
| Class 2 and 3 track | 4′8″ | 4′9
3/4″.
|
| Class 4 and 5 track | 4′8″ | 4′9
1/2″. |