Japan's railroad system has a big geographic advantage - the country is long and narrow. The railroad system is primarily a long end to end line with short crosswise branches.[1] That's an efficient structure. The branch lines don't have to be fast. Many are still narrow gauge, at 3 ft 6 in. The US had to fill a huge area in the railroad era. That left a lot of underutilized track once the road network got good. [1]…
>the country is long and narrow This is a little counterintuitive but it does make a difference. I recently moved from a coastal city (that is very linear) to a landlocked city spread evenly in all directions. I had naively assumed the new city would be easier to get around in, since on average places would be closer to you. But the first city has decent commuter rail, which meant I could get to the other end of the…
You don't have to be "sure", take a look at London which is a "round" city with excellent public transit.