{"data":{"id":"us/49-cfr-236.205","jurisdiction":"us","citation":"49 CFR 236.205","heading":"Signal control circuits; requirements.","body":"The circuits shall be so installed that each signal governing train movements into a block will display its most restrictive aspect when any of the following conditions obtain within the block:\n(a) Occupancy by a train, locomotive, or car,\n(b) When points of a switch are not closed in proper position,\n(c) When an independently operated fouling point derail equipped with switch circuit controller is not in derailing position,\n(d) When a track relay is in de-energized position or a device which functions as a track relay is in its most restrictive state; or when signal control circuit is deenergized.","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 B—Automatic Block 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":"bbdfd6be4f55c052d56456b1072f716cecad3ae0c19bddf10e856d483918265f","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.204","next":"us/49-cfr-236.206"},"notice":"GroundRules: Original legal text. Not legal advice."}