How I used to do:
I have 55+ copper mine stations, and a central dump station with 8 stations with the same name, currently using 35-something of the mining stations. (copper Mine 1, Copper Mine 2 etc)
In the Old UI I could just click on the dumpstation, and see a list of what target stations were assigned to trains going to the dumpstation and see how high the count was and easily send new train to a unused mining station.
With the current UI all I see is a large bloated tiles with all trains and where they are heading, not what stations are connected to them
