You need to get hit by a train at full speed. However, please bare in mind your armors natural resistance to impact/physical damage. If you get hit by a train and you still aren't getting the achievement, place a cargo wagon on it and load it up with ore/junk to increase its weight. That should do t...

. Like fuel, water and lubricant for steam engines? I think this is a nice idea, but it sounds complicated to built that. On the other hand it would add the need to have something like an support-center for trains, where you can built trains, automatically bringing them onto rails and refuel them. ...

Planes are just like Trains... but with no rails and bigger stations, which will leave trains obsolete. I mean sure you'd still use trains in the mid-game, but as soon as you unlock planes, there would be no reason to keep laying new rail when you can just throw down a runway somewhere and have aer...