California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 4 - General Mobile Equipment and Auxiliaries
Article 29 - Industrial Railroads
Section 3736 - Overhead Clearances for Standard Gage Industrial Railroad Tracks

(a) The minimum overhead clearance above industrial railroad tracks which are used for transporting freight cars, shall be 22 feet 6 inches.

(b) The overhead clearance above top of rail of such tracks located inside of buildings may be reduced to 18 feet, provided that this clearance shall apply only to tracks terminating within the building, and further provided, that when an overhead clearance of less than 22 feet exists on tracks inside such building, all cars, trains, motors, engines or other equipment shall be brought to a stop before entering such building.

(c) Unless otherwise provided herein, overhead clearances authorized in this section are applicable only to tracks on which freight cars having a height not exceeding 15 feet 6 inches are transported. Freight cars of a height exceeding 15 feet 4 inches, but not greater than 15 feet 6 inches shall be permanently marked, stenciled, or placarded as hereinafter required, and such markings maintained in a legible condition reading as follows: "This car excess height." The markings required in this subsection shall be made permanent on owned cars as soon as practicable with a three-quarter-inch stripe outlining an area not less than seven inches by ten inches, such stripes and lettering to be of a color contrasting with the car body color. All such required markings and placarding shall be placed on the side adjacent to the ladder or handholds near the floor line of the car at each of the four corners.

(d) Freight cars not exceeding a height of 15 feet 6 inches may be transported without compliance with the requirements of (c) of this order provided that the tracks over which such operations are conducted exhibit throughout the route an overhead clearance of 22 feet 6 inches as required in (a) of this order.

(e) If freight cars of a height greater than 15 feet 6 inches are transported, minimum overhead clearances shall be increased by an amount not less than such additional height.