After using the Tokyo train system, i shudder to think of what we call “mass transit”. In Tokyo you can go anywhere within a reasonable time because they have the famous Yamanote line that looks like a theta (a circle with a line through the middle). Also, almost every other private line connects with at least two of those stations, from what I remember. Where I live now, I wouldn’t think of taking mass transit anywhere unless I had a real surfeit of time.