Okay, so... I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Garak was right about one thing: a guilty conscience is a small price to pay for the safety of the Alpha Quadrant. So I will learn to live with it... Because I can live with it... I can live with it... Computer - erase that entire personal log.
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...
Meanwhile most passenger trains in Germany are double-headed. They have only one locomotive, but the last wagon also has a driver's cabin so the locomotive can push the train while still being controlled from the front
That's why I ask if they want the full in depth explanation or the short one. Well it happened once during Dune so far, she asked for the full one. I can't even recall the question but she thought it made more sense after at least, maybe to do with blade fighting and shields, they really hammer it in the novels. Though to be fair any Dune explanation sounds better from the books than either movie, okay I haven't seen the last half of Lynch's Dune in decades but the first half didn't explain things well so I don't expect the last half to be better from my fuzzy memory.
Dune may be a bit of a special case compared to the franchises listed too.