Frog guard rails and guard faces; gauge.

The guard check and guard face gages in frogs shall be within the limits prescribed in the following table: Table 1 to § 299.333 Track class Guard check gage The distance between the gauge 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 gauge line, 2 may not be less than— Guard face gage The distance between the guard lines, 1 measured across the track at right angles to the gauge line, 2 may not be more than— H0-H7 1,393 mm 1,358 mm. 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 14 mm (0.55 inches) 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.