U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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All TitlesTitle 49Chapter IIPart 213Subpart G - Subpart G—Train Operations at Track Classes 6 and Higher
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(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
|
|
| Class 7 track | 4′8″ | 4′9
|
|
| Class 8 track | 4′8″ | 4′9
|
|
| Class 9 track | 4′8
| 4′9
|
|
