TL;DR
Train stops currently show trains that have that stop in their schedule. They should do the same, possibly in a separate tab, for trains that access that stop via an interrupt.What?
When an interrupt triggers, it will insert a temporary stop for the target of the interrupt. If you happen to look at the train overview, you will see the train is heading for that stop. However, if no trains currently have the interrupt triggered, it looks like no trains are using that stop, and I have to go through maybe not all my trains but through a lot of them trying to find who just accessed that stop. It would be very convenient to see here are the two or three trains that have that interrupt.I don't think it is necessary and in fact it would be more confusing than helpful for a generic interrupt to show up. So if a train is going to wildcard- unload, I do not want to see it.
So I think there are two parts to this idea, one that a train stop should show hard coded interrupts for that stop, and a second part to show which trains are using that interrupt.