this post title tells you to read the video title

Ok but from my really screwed up factory, I purged a giant area around the main factory. So now I need a way to defend all those areas eventually.

I think the only way that's gonna work is going to be train-to-pilpeline at some natural choke points as I start setting up an actual defense perimiter. As I don't imagine my ring of mines is actually going to do much should it come to it.