Whistle Code
Train whistles are used to communicate with other railroad workers on a train or in the yard. Different combinations of long and short whistles each have their own meaning. They are used to pass instructions, as a safety signal, and to warn of impending movements of a train. Despite the advent of modern radio communication, many of these whistle signals are still used today. (See also Train horn (Common horn signals).)
Signals illustrated below are for North American railroads, "o" for short sounds, and "-" for longer sounds.
| Sequence | Meaning |
|---|---|
| Succession of short sounds | Used when an emergency exists, or if persons or livestock are on the track. |
| – | When train is stopped. The air brakes are applied and pressure is equalized. |
| – – | Train releases brakes and proceeds. |
| o o | Acknowledgment of any signal not otherwise provided for. |
| o o o | When train is stopped: means backing up, or acknowledgment of a hand signal to back up; when moving: stop at next station. |
| o o o o | Request for a signal to be given or repeated if not understood. |
| – o o | Warning that a second section of a timetabled train is following. |
| – o o o | Instruction for flagman to protect rear of train. |
| – – – – | Flagman return from the west or south. |
| – – – – – | Flagman return from the east or north. |
| – – o – | Train is approaching public grade crossing(s). This is known as Rule 14L in almost all railroad operating rules. |
| – o | Inspect the brake system for leaks or sticking brakes. |
Read more about this topic: Train Whistle
Famous quotes containing the words whistle and/or code:
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—Diogenes of Sinope (c. 410–320 B.C.)
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—Alice Foote MacDougall (1867–1945)