@actuallyautistic

This whole thing about nuclear trains reminds me of something I got caught up in a while ago. I'm a Trekkie, and I ran across a diagram of a starbase, with dimensions (based on size in relationship to ship, etc.). I started a spreadsheet, it got more and more complex.
Those things are HUGE. 2,000 acres of parkland. Hundreds of millions of square feet in deck space. Nominal population of over 2,000,000 people, and that's with low population density. I still have it, somewhere.