- These ship- or factory-type whistles cannot be "played" by a person.
They're powered by some sort of energy (steam, electricity, whatever).
The verb for playing an instrument is {chu'}...
- The verb to activate a wall-mounted device is {chu'} (not {SuS}).
... but the verb for activating a device is also {chu'}.
So is the verb to use for playing a ship's whistle using the switch or whatever that activates it, which is mounted on a panel or wall or whatever, {chu'} or not?