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. § 236.305

Approach or time locking

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Approach or time locking shall be provided in connection with signals displaying aspects with indications more favorable than “proceed at restricted speed.”