{"data":{"id":"us/49-cfr-236.556","jurisdiction":"us","citation":"49 CFR 236.556","heading":"Adjustment of relay.","body":"Change in adjustment of relay shall be made only in a shop equipped for that purpose except when receiver coils, electro-pneumatic valve, or other essential part of the equipment is replaced. Irregularities in power-supply voltage or other variable factors in the circuit shall not be compensated for by adjustment of the relay.","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":"ce4fd221e18d93068a59aa1f9438b46e4520f67480d723e45fe50f5cb4363ec4","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-236.555","next":"us/49-cfr-236.557"},"notice":"GroundRules: Original legal text. Not legal advice."}