C.F.R. » Title 49 » CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES › Subpart A—Rules and Instructions: All Systems

49 C.F.R. § 236.22

Semaphore signal arm; clearance to other objects

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At least one-half inch clearance shall be provided between semaphore signal arm, and any object that may interfere with its operation.