You more likely to get answers if you register your copy of Trainz which currently doesn't show on your timeline next to your name. It is also the only way you'll get access to the DLS (download station) and over 1/2 a million free assets.
To answer your question Cornelius, you can’t. It is impossible for two hornsounds to be attached to one locomotive. Sure, you could use the bell sound, but that would eliminate the bell. Even with an advanced script you can’t, the game just doesn’t allow it.
On the registration issue. If you have registered and if you bought the program on Steam, contact the Helpdesk here: http://support.trainzportal.com/ and explain to them that your TRS2019 doesn't appear on your timeline in the forums and they will fix that for you. Sometimes problems occur with the connection between Steam and N3V's servers that causes the registration not to appear.
