213.323—Track gage.
(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.
| 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— |
|---|---|---|---|
| 6 | ′8″ | 4′91/4″ | 1/2″ |
| 7 | 4′8″ | 4′91/4″ | 1/2″ |
| 8 | 4′8″ | 4′91/4″ | 1/2″ |
| 9 | 4′81/4″ | 4′91/4″ | 1/2″ |