<s>[INST] I am attempting to build a large model railroad with a unique concept. I want the railroad to be linear, with no curves or bends, only straight lines. This could be easy with some creative track planning to account for the rest of the geometry in your space.  I wanted to start with a more or less realistic depiction of a northern Virginia railroad system in the 1970s.  There are no curves. Back in the day we made the many large scale models for the US military and had to rely on angles and kinks to envision movement from the side you will be viewing the model however I was fortunate enough to see how the railroad could really operate on a real railroad that really did have many similarities to what I was working on. I was able to envision my model railroad's gravity flow design as real railroad professionals do when evaluating railroad systems.[/INST]