Sorry for my not-so-well english, but it's kinda hard to describe the problem I have.
I'd like to use existing railroads to transport new cargo over a big distance. Because the "new" cargo isn't accepted by the breakpoint-trainstations, I have to force the trains explicitly to unload the cargo at the appropriate stations so another train (on another railroad) can pick it up and transport it to the proper destination.
Now my problem is, that I can't declare what kind cargo should be unloaded. So if I only want to stop at a trainstation, to unload a part of it's cargo (which will be transported further), the train can't continue to it's real destination because the cargo for it's real destination was also unloaded.
I hope you get it

Greets
Joel
(and BIG THX to the developer's! I LOVED IT AND I LOVE IT AGAIN!)