These tickets are valid for all Tokyo Metro and Toei Subway lines for 24 hours, 48 hours, or 72 hours from the travel starting time. There is an extensive list of places to buy this ticket type, so it’s readily available. Cost: Tokyo Subway 24-hour Ticket – Adult: 800 yen, Child: 400 yen.
Tokyo has a lot of train and subway lines, run by a lot of different companies and it can get confusing. For the most part, if you have a tap-to-pay card — see below — it’s really cheap (just a few hundred yen to go anywhere in central Tokyo) and it doesn’t matter what which company is running the line or whether it’s a subway or a train.Tokyo has tons of "commuter" rail which are essentially de-facto "metro" or rapid transit (see the Yamanote line), or S-bahn like services. When you look at rail system vs rail system Tokyo has far more stations than NYC, and it's not even close. You are correct on the 24/7 though. But muh express service.
500m stop spacing is very large for buses and middling for metro. You generally want stops closer together in denser areas and further apart in less dense areas, and more frequent stops for buses and trams than for trains. For buses, I'd aim for 200-300m. For metro, I'd aim for 300m-1km. Most of your lines, especially rail, should be radial lines. aWv7dY.