{"data":{"id":"us/49-cfr-236.827","jurisdiction":"us","citation":"49 CFR 236.827","heading":"System, block signal.","body":"A method of governing the movement of trains into or within one or more blocks by block signals or cab signals.","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":"0e5ba902194ce419880d086b31ea8a056884c290f4ce53d8e206991fb59d6d10","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.826","next":"us/49-cfr-236.828"},"notice":"GroundRules: Original legal text. Not legal advice."}