{"data":{"id":"us/49-cfr-236.709","jurisdiction":"us","citation":"49 CFR 236.709","heading":"Block, absolute.","body":"A block in which no train is permitted to enter while it is occupied by another train.","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":"c1d463083545139ae88457d1b39aedc5890d2b868e39767f17cdd02dbb2dc5d0","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.708","next":"us/49-cfr-236.710"},"notice":"GroundRules: Original legal text. Not legal advice."}