Okay so you can use double-headed trains but these are less efficient because the backwards facing locomotive isn't powering the train. If you need to get into a tight water-locked area, these are useful, but really, you want to invest in dual-track, unidirectional train infrastructure from the get-go. Now, a lot of people wonder, should I use a 1x4 configuration, a 2x6 config, or something else. In this essay, I will...