What do the number or length of train and ship whistles mean?

Train:

1. One long beep: start attention signal.

2. Two long sounds ━ ━: Regression signal.

3. Three long sounds ━ ━ ━: summoning signal.

4. One long and one short sound━·: signal to turn on the steam.

5. One long and two short beeps━··: steam shut-off signal.

6. One short sound and one long sound·━: Bow lowering signal on the way.

7. Two short sounds and one long sound...: call signal.

8. One long and three short beeps━···: alarm signal.

9. One short sound·: Test the automatic brake and repeat signal.

10. Two short beeps··: relief and slip signal.

11. Three short beeps...: Tighten the handbrake signal.

12. Continuous short beeps...: emergency stop signal.

Ship:

One short beep, please join the ship from the port side of the east ship;

Two short beeps, please join the ship from the starboard side of the east ship;

Three short beeps, the ship is officially reversing or has a tendency to reverse;

Four short beeps, it does not agree with the other party's request, and asks the other party to take evasive action;

Six short beeps, the ship is reversing Call for help in danger;

One long beep, the ship leaves the dock or berth;

Two long beeps, requesting to pass through the lock or berth;

Three long beeps, there is someone Falling into the water and needing rescue;

One long and one short sound, the ship is turning to the right or turning around;

One long and two short sounds, the ship is turning to the left or turning around;

One long, one short, and another long, I hope to contact you;

Two long and one short, the overtaking ship must pass on the starboard side of the leading ship;

Two A long sound and two short sounds, the overtaking ship must pass on the port side of the preceding ship;

One long sound, one short sound, another long sound and another short sound, agree to the other party's request;

One long sound, two short sounds, and one long sound

Three short sounds and one long sound, this ship needs assistance.