{"data":{"id":"us/49-cfr-230.51","jurisdiction":"us","citation":"49 CFR 230.51","heading":"Number and location.","body":"Every boiler shall be equipped with at least two water glasses. The lowest reading of the water glasses shall not be less than 3 inches above the highest part of the crown sheet. If gauge cocks are used, the reading of the lowest gauge cock shall not be less than 3 inches above the highest part of the crown sheet.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS","Subpart B—Boilers and Appurtenances"],"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":"b6d3adb228e26f4590e965f3b03a842d966f0ed0f03ca1ee4e2270a1fd896c91","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-230.50","next":"us/49-cfr-230.52"},"notice":"GroundRules: Original legal text. Not legal advice."}