49 C.F.R. § 222.21 When must a locomotive horn be used?
Title 49 - Transportation
(a) Except as provided in this part, the locomotive horn on the lead locomotive of a train, lite locomotive consist, individual locomotive, or lead cab car shall be sounded when such locomotive or lead cab car is approaching a public highway-rail grade crossing. Sounding of the locomotive horn with two long, one short, and one long blast shall be initiated at a location so as to be in accordance with paragraph (b) of this section and shall be repeated or prolonged until the locomotive or train occupies the crossing. This pattern may be varied as necessary where crossings are spaced closely together. (b)(1) Except as provided in paragraph (b)(2) of this section, the locomotive horn shall begin to be sounded at least 15 seconds, but no more than 20 seconds, before the locomotive enters the crossing. (2) Trains, locomotive consists, and individual locomotives traveling at speeds in excess of 45 mph shall not begin sounding the horn more than one-quarter mile (1,320 feet) in advance of the nearest public highway-rail grade crossing, even if the advance warning provided by the locomotive horn will be less than 15 seconds in duration. (c) As stated in §222.3(c) of this part, this section does not apply to any Chicago Region highway-rail grade crossing at which railroads were excused from sounding the locomotive horn by the Illinois Commerce Commission, and where railroads did not sound the horn, as of December 18, 2003.
Title 49: Transportation
PART 222—USE OF LOCOMOTIVE HORNS AT PUBLIC HIGHWAY-RAIL GRADE CROSSINGS
Subpart B—Use of Locomotive Horns
§ 222.21 When must a locomotive horn be used?
