Factorio Forums

I have lots of trouble with building railroads, like many other Factorians. I would like a mod that helps guide the player in railroad placing, creating, fixing.
It gives you notifications if two trains have the capability of crashing and shows you how to fix it, or if you can't reach a station, it helps you fix missing tracks.

F4 is your friend.
show_rail_ paths, connections, and segments are all useful in troubleshooting railways.