Completely demolishing your factory because it doesn't seem to support everything you want.

[tk0421]

Almost every new game I start, I go into it knowing my original smelter and red-green-grey-blue and first refinery will get obliterated and replaced.

then I METICULOUSLY plan out the new factory, and even the rail layout. and then after all the planning, about halfway through building that entire system (with rocket factory included) I see something better (shuttup OCD leave me alone) and watch robots go completely crazy trying to destroy and store everything so I can create megaville on the ruins...