Section 229-501-02 - DEFINITIONSA. Height of Freight Car. Height of freight car is the vertical distance between the top of the rail and the top of the running board.B. Width of a Freight Car. Width of a freight car shall mean twice the distance from the center line of the car to the extreme outside part thereof.C. Overhead Clearance. Overhead clearance shall mean the normal distance from the plane of the tops of the rails to a structure or obstruction above.D. Side Clearance. Side clearance shall mean the distance from the center line of the track, to a structure or obstruction at the side of the track, parallel to the plane of the tops of the rails.17-229 C.M.R. ch. 501, § 02