You may have the command already in your Trainz install. Go to the session and enable that command in driver setup to add the command to your list of available commands for the drivers to use.
I am confused. The 'Decouple' does not show up in any of my command lists, but when you click the edit button in the Driver Command area it shows up there and has a checkmark by it, but that is the only place I can see the command listed. It just doesn't show up in any of the other command list windows. Like I said I downloaded the 'Decouple number #' command from CM and it does show up in my driver commands list. I don't know what I am doing wrong....................
John