{"data":{"id":"us/49-cfr-236.577","jurisdiction":"us","citation":"49 CFR 236.577","heading":"Test, acknowledgement, and cut-in circuits.","body":"Test, acknowledgement, and cut-in circuits shall be tested at least once every twelve months.","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 E—Automatic Train Stop, Train Control and Cab Signal Systems"],"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":"14038ac6b4d90a315ffe656894d6f21076679d7324c4ca0684996c21def310c1","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.576","next":"us/49-cfr-236.586"},"notice":"GroundRules: Original legal text. Not legal advice."}