Adds factory buildings you can walk into and build parts of your factory inside. This mod will not be updated for Factorio 0.15! Get Factorissimo2 instead, it's much better.
Thoughts on adding a train station with similar functionality? Basically you can bring tracks into/out of the building and trains can go in/out.
Only issue I see is that it may not work with train pathing....
I would love to implement something like that, but it's ridiculously impossible using the API.