Right I have been playing this game for years now and I keep having the same problem it says all over the web and the manual that "~" is the buzzer control however every time I press that it does not turn the buzzer off ("This is a UK QWERTY keyboard"). The way my keyboard is set up is that the "~" key is shared with the "#" key and I have to Hold shift to get to the "~" key as the "#" is the default (bottom) part of the key.
I want to know if I have configured something wrong or if my keyboard is wrong because I don't want to have to keep switching to AI just to turn off the buzzer
Just turn off your ATB or ZUB, to avoid your train being stopped. If you wish to turn it off press ctrl+shift+a. You can now drive with the buzzer still buzzing. Eventually when you are doing your duty turn it on again.
This may sound strange but although ~ is the set key in my game it doesnt work but strangely the @ key to the left (UK QWERTY) works so idk if it's a keyboard problem or a game bug where its getting the keys confused