213.143—Frog guard rails and guard faces; gage.
The guard check and guard face gages in frogs shall be within the limits prescribed in the following table—
| Class of track | Guard check gageThe distance between the gage line of a frog to the guard line 1 of its guard rail or guarding face, measured across the track at right angles to the gage line 2, may not be less than— | Guard face gageThe distance between guard lines 1, measured across the track at right angles to the gage line 2, may not be more than— |
|---|---|---|
| Class 1 track | 4′61/8″ | 4′ 51/4″ |
| Class 2 track | 4′61/4″ | 4′ 51/8″ |
| Class 3 and 4 track | 4′ 63/8″ | 4′51/8″ |
| Class 5 track | 4′61/2″ | 4′ 5″ |
| 1 A line along that side of the flangeway which is nearer to the center of the track and at the same elevation as the gage line. | ||
| 2 A line 5/8 inch below the top of the center line of the head of the running rail, or corresponding location of the tread portion of the track structure. | ||