[soruly]

> Rush hour had a train there every ~2 minutes

actually 2 trains every ~2 minutes on the east side of the yamanote loop, it runs in parallel with keihin tohoku line every station from tabata to sinagawa. The platforms are arranged side by side, so if you miss one train, the next train is probably right behind you. it's fun to see trains racing right next to each other. Other than that there are also rapid lines running in parallel that takes you straight to major stations by skipping some smaller ones.