{"data":{"id":"us/49-cfr-236.751","jurisdiction":"us","citation":"49 CFR 236.751","heading":"Interlocking, manual.","body":"An arrangement of signals and signal appliances operated from an interlocking machine and so interconnected by means of mechanical and/or electric locking that their movements must succeed each other in proper sequence, train movements over all routes being governed by signal indication.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","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 G—Definitions"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"e0d8805549bb1d555433539bfccde2233127d403333e8be86738188c0baa39d5","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.750","next":"us/49-cfr-236.752"},"notice":"GroundRules: Original legal text. Not legal advice."}