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PART 222 - USE OF LOCOMOTIVE HORNS AT PUBLIC HIGHWAY-RAIL GRADE CROSSINGS Authority:49 U.S.C. 20103, 20107, 20153, 21301, 21304; 28 U.S.C. 2461, note; and 49 CFR 1.89. Source:71 FR 47634, Aug. 17, 2006, unless otherwise noted.