49 C.F.R. § 213.355 Frog guard rails and guard faces; gage.
Title 49 - Transportation
The guard check and guard face gages in frogs shall be within the limits prescribed in the following table—
Title 49: Transportation
PART 213—TRACK SAFETY STANDARDS
Subpart G—Train Operations at Track Classes 6 and Higher
§ 213.355 Frog guard rails and guard faces; gage.
---------------------------------------------------------------------------------------------------------------- Guard check gage_The distance between the gage line of a frog to the guard line \1\ of its Guard face gage_The distance between Class of track guard rail or guarding face, guard lines, \1\ measured across the measured across the track at track at right angles to the gage right angles to the gage line, line, \2\ may not be more than_ \2\ may not be less than_----------------------------------------------------------------------------------------------------------------Class 6 track........................... 4[foot]6\1/2\[inch]............ 4[foot]5[inch]Class 7 track........................... 4[foot]6\1/2\[inch]............ 4[foot]5[inch]Class 8 track........................... 4[foot]6\1/2\[inch]............ 4[foot]5[inch]Class 9 track........................... 4[foot]6\1/2\[inch]............ 4[foot] 5[inch]----------------------------------------------------------------------------------------------------------------\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.
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