(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: ----------------------------------------------------------------------------------------------------------------
The change of
gage within 31
Class of track The gage must But not more feet must not
be at least-- than-- be greater
than------------------------------------------------------------------------------------------------------------------Class 6 track................................................... 48" 49\1/4\" \3/4\"Class 7 track................................................... 48" 49\1/4\" \1/2\"Class 8 track................................................... 48" 49\1/4\" \1/2\"Class 9 track................................................... 48\1/4\" 49\1/4\" \1/2\"---------------------------------------------------------------------------------------------------------------- [63 FR 34029, June 22, 1998, as amended at 78 FR 16104, Mar. 13, 2013]