{"data":{"id":"us/49-cfr-236.335","jurisdiction":"us","citation":"49 CFR 236.335","heading":"Dogs, stops and trunnions of mechanical locking.","body":"Driving pieces, dogs, stops and trunnions shall be rigidly secured to locking bars. Swing dogs shall have full and free movement. Top plates shall be maintained securely in place.","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 C—Interlocking"],"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":"4cbd53a030af7def8b0237c14e3a00e389ccacf751d2900bf603ac11ea5d0978","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.334","next":"us/49-cfr-236.336"},"notice":"GroundRules: Original legal text. Not legal advice."}