I have a trade port. I have a passenger station. I would like them to work together and get the supposed rail shipping. I have rerouted my rail line to go to the trade port. I have added a 2nd passenger station right next door to the trade port. I cannot get them to ship rail. I am not seeing any upgrade options. Is there something else I should be looking for? This is an industrial town and I have set it up to make most of it's money that way and I am currently hemorrhaging money trying to ship via rail. THANKS!