{"data":{"id":"us/49-cfr-213.323","jurisdiction":"us","citation":"49 CFR 213.323","heading":"Track gage.","body":"(a) Gage is measured between the heads of the rails at right-angles to the rails in a plane five-eighths of an inch below the top of the rail head.\n(b) Gage shall be within the limits prescribed in the following table:\nClass of track The gage must be at least— But not more than— The change of gage within 31 feet must not be greater than—\nClass 6 track 4′8″ 4′91⁄4″ 3⁄4″\nClass 7 track 4′8″ 4′91⁄4″ 1⁄2″\nClass 8 track 4′8″ 4′91⁄4″ 1⁄2″\nClass 9 track 4′81⁄4″ 4′91⁄4″ 1⁄2″","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 213—TRACK SAFETY STANDARDS","Subpart G—Train Operations at Track Classes 6 and Higher"],"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":"74949017ef270e2d5918616dbd70e0659646b87c93d92cf7ad57718343e9d37e","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-213.321","next":"us/49-cfr-213.327"},"notice":"GroundRules: Original legal text. Not legal advice."}