(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-- ----------------------------------------------------------------------------------------------------------------
Class of track The gage must be at least-- But not more than------------------------------------------------------------------------------------------------------------------Excepted track.......................... N/A............................ 410\1/4\.Class 1 track........................... 48.................. 410.Class 2 and 3 track..................... 48.................. 49\3/4\.Class 4 and 5 track..................... 48.................. 49\1/2\.----------------------------------------------------------------------------------------------------------------