That's what I eventually end up doing after there's too many trains to turn on and off all the time, but I'd much rather not have to do any of that. Still hoping this eventually makes it into 2.1.

TL;DR
Interrupt condition to check whether a given train stop exists.


What?
Same as the "stop is full/not full" conditions we already have, except check for whether it exists instead.

Why?
It's not uncommon that I find myself building a provider station for some item before the item is ...