I don't see why train count should read the number of trains counting towards the train limit.
No where does it say this.

It literally says, "Reads the number of trains going to this particular train stop. Includes the stopped train."

If we could at least read the train ID while it’s blocking, we ...

I agree with bountygiver.
This seems like a bug.

I'm trying to use the feature to automate the balance of requesting and supplying train stations.
Subtracting one from the requesting train stations whenever a train is en-route to supplying train station.
Then removing the request from the ...