I downloaded the Change Destination Sign command, and instead of showing destination signs in the menu, trackmark names appear instead and none of them change the sign.
I'll take a guess at the one as I have never tried it my self.
But could it be you have to lay a track mark down at the destination you want to go to and name it with the name of the place you are going to. Then select that track mark with the Change Destination Sign command………seems sensible to me!
The command is only tested with TRS2004SP4 and later versions.
The traincar must support the destination changing by this command.
There is a companion rule DestSignTable, which could be added to the session. It allows to define destination entries for the command, and to select what to use for destinations (trackmarks, industry names or table entries).
For traincars using texture-replacement for the sign you could import the correct names into the table (You have to place the traincar first with TRS2006 and later).
There is a companion rule DestSignTable, which could be added to the session. It allows to define destination entries for the command, and to select what to use for destinations (trackmarks, industry names or table entries).