{"data":{"id":"us/49-cfr-236.719","jurisdiction":"us","citation":"49 CFR 236.719","heading":"Circuit, acknowledgment.","body":"A circuit consisting of wire or other conducting material installed between the track rails at each signal in territory where an automatic train stop system or cab signal system of the continuous inductive type with 2-indication cab signals is in service, to enforce acknowledgement by the engineman at each signal displaying an aspect requiring a stop.","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":"082326741627282533b4ccf490aaa8348ce14960c8529a4359a2bbc656cb2fd4","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.718","next":"us/49-cfr-236.720"},"notice":"GroundRules: Original legal text. Not legal advice."}