The longest uninterrupted trade chain that gives the bonus trade income thing. It's being re-done somehow for Entrenchment, since IC admitted the algorithm for it in vanilla isn't that great. Blair said it's going to be a part of something new they're doing so it won't be in beta 1 of Entrenchment, but sounds like it'll be in for the final if not other phases.
Ok gotcha, yeah the trade route thing is a bit iffy....
This time tomorrow, we all could have a starbase up pounding our enemies!!!!