It appears the stop output signals are set the moment the train arrives. So yes, when I threw a stack in during unloading, that was too late, but when I added a stack to the train before it arrived at the station, it was not unloaded. Makes sense now.

I'm going to assume the storage chest in the ...

Thanks for the details! That certainly clears some things up.

From the stop output (combinator), you get the desired train inventory
Ok, I suspect I know where I confused myself - bear with me. If a train arrives carrying 5000 iron + 5000 copper, and is here to deliver iron (not sure why it would ...

I've got a decent understanding of LTN, but I'm trying to understand everything . I'm looking at the examples in this post and this reddit post , and getting lost on several points. Generally, I've got plenty of info on how to do things, but not why they're done.

1) On the requester station, there ...