How do I disable a station once a train is present? In the past, before Smarter Trains I used this system: https://imgur.com/a/2n6Gh

I've got a minimum of station names, for example I've got 10 'provider' stations all named 'Iron Plate Loading', there are 10 trains running Iron plates so that's a bay for each one, no issues there.
Spread across the factory are about 20 'Iron Plate Unloader' stations. Currently all trains are queueing up at the closest unload station, causing a massive gridlock across the railsways. I would like to be able to use Smarter Trains to disable an occupied station so any en-route trains will divert to one of the other 19 vacant ones.

Perhaps this is already possible using Smarter Trains but I've been unable to find this option.