Rule 19(b) Sound: _ _ o _
When approaching a public highway-rail crossing grade and at a whistle sign displaying “W”, “W/MX”, or other specified aspect, with the engine in front, start whistle at least 15 seconds but not more than 20 seconds before occupying the crossing. The signal must be prolonged or repeated until the engine occupies the crossing. For multiple crossings, the signal must be prolonged or repeated until the last crossing is occupied.
For trains and engines exceeding 60 MPH, the whistle signal must not be started more than ¼ mile in advance of the public grade crossing, even if the advance warning provided by the locomotive horn will be less than 15 seconds in duration.
When a train or engine is stopped at a location such that it will take less than 15 seconds for the movement to occupy a public crossing, the whistle signal may be sounded for less than 15 seconds provided:
- The public grade crossing is equipped with automatic flashing lights and gates and the gates are fully lowered;
- There are no conflicting highway movements approaching the public grade crossing.
EXCEPTION: This warning must not be sounded at a whistle sign indicating “W/R” or in areas otherwise designated as Quiet Zones, except in an emergency.