LUL D78 Stock Modifications Trainz

While I don't know exactly how, I am aware of two Trainz users who have made routes where the train passes some kind of trigger and "the next station is ___" is announced. The still active Alterr is one of these users, though there may be a bit difficulty trying to contact him as he's Russian/German. My best advice would be to look around through tutorials. If you want it to say, "This is a Metropolitan line train to ___" You can always make that a bell sound... I do believe there is a door sound though I believe it is only for the time period the doors actually open--these would be the door beeping sounds. If you want to see what I mean you can see this video by Alterr:
I know it doesn't solve your problem but I thought you might appreciate knowing it IS possible.
Eric