My bad, im new to forums and didnt really look all that hard to find people who had suggested this. And was really eager to give the idea as i though i had thought of it first! Again my bad!

So throughout my playing of factorio I have run into one problem with my trains. Sometimes I need them to go under an entire base or sometimes even just under a wall. Now, I know what you're thinking. "Just go around it. That simple." But here is the thing. I don't want to. It would be so ...