49 CFR 213.137 - Frogs.
(a) The flangeway depth measured from a plane across the wheel-bearing area of a frog on Class 1 track shall not be less than 13/8 inches, or less than 11/2 inches on Classes 2 through 5 track.
(b) If a frog point is chipped, broken, or worn more than five-eighths inch down and 6 inches back, operating speed over the frog shall not be more than 10 m.p.h.
(c) If the tread portion of a frog casting is worn down more than three-eighths inch below the original contour, operating speed over that frog shall not be more than 10 m.p.h.
Title 49 published on 2014-10-01
no entries appear in the Federal Register after this date.