Thanks for all the suggestions and pointers. This is what I have come up with as my fix. Works the way I wanted..

attached is a photo of what is happening....
Trains are going to 4 locations and jamming up the track....

My problem is, I have 4 locations where my trains drop off iron ore for processing, but I have 12 trains doing it.
I want to keep my trains parked in a remote stacker until a station is clear. not sure how to set up combinators to make this work.
Any help or videos on how to do this would be ...