No real point in using a tank for such a strategy, just load up on shields,exo and generators, grab a combat shotgun, and go to town on nests.

I previously thought I understood how the Rail signals function, but I've ran into an issue with a section of track.
http://i.imgur.com/hxITzwl.jpg

This situation now occurs every time the trains attempt to return to the station on the left. Even if I manually let the train on the left trough ...