TL;DR
Let all of the wildcards, not just "Any Signal", be placed in the interrupt condition.What?
Let the other wildcards- currently "Any Item," "Any Fluid," and "Any Fuel" be placed in the interrupt condition, not just "Any Signal".- wildcard.png (192.92 KiB) Viewed 174 times
Why?
This would let you send a train a wildcard indicating a cargo type (item/fluid/fuel) and a control signal for other conditions (ie "L==1" to say "you're loaded and can leave") to a train without the cargo wildcard trying to stick the control signal into the destination station wildcard.The interrupt destination already accepts the other wildcards, so it's also just counterintuitive that you can't filter the input in the same way that you filter the output. If a player tries to do it anyway, the "Any Signal" wildcard can match to something the destination station name can't take as an input and this results in the "Any Signal" wildcard appearing in the destination station name and a stuck train.