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 C—Interlocking

49 C.F.R. § 236.337

Locking faces of mechanical locking; fit

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Locking faces shall fit squarely against each other with a minimum engagement when locked of at least one-half the designed locking face.