Tired of digging tunnels? Tired of placing rails?
This is the solution:
This is the rail gun mod

The Guns consume the rails from your inventory and automatically dig a 3*3 hole in the wall with your rail in the center on the ground!

You can find structure of the recipe of the guns on one picture, but keep in mind that the rail you want to consume and to spawn must be placed in the left upper corner.

This mod requires just Risugami's modloader