when i accidentally remove the controller, the train built by this controller disappears to nowhere. Until i put the controller back, the train also back to the builder. And i realized i couldn't build another train because the controller was stuck in the first locomotive and couldn't build another one.
edit 1: i just figured out how it works but the fun here is i can use this glitch by making the train disappear, changing the recipe into another wagon like cargo wagon to artillery wagon, and put the controller back. I get another wagon
