Switch boxes, switch operating mechanisms necessary for the control and operation of signals, and interlockers projecting 4 inches or less above top of rail, shall each have side clearances of no less than 3 feet.
Okla. Admin. Code § 165:32-5-7
Switch boxes, switch operating mechanisms necessary for the control and operation of signals, and interlockers projecting 4 inches or less above top of rail, shall each have side clearances of no less than 3 feet.
Okla. Admin. Code § 165:32-5-7