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49 U.S.C. 20102-20114 and 20142; 28 U.S.C. 2461 note; and 49 CFR 1.89.
63 FR 34029, June 22, 1998, unless otherwise noted.
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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′91⁄4″ | 3⁄4″ |
| Class 7 track | 4′8″ | 4′91⁄4″ | 1⁄2″ |
| Class 8 track | 4′8″ | 4′91⁄4″ | 1⁄2″ |
| Class 9 track | 4′81⁄4″ | 4′91⁄4″ | 1⁄2″ |
[63 FR 34029, June 22, 1998, as amended at 78 FR 16104, Mar. 13, 2013]