Passengers rush through the West Exit during morning rush hour, Shinjuku, Tokyo. With up to 4 million passengers passing through it every day, Shinjuku Station in Tokyo, Japan is the busiest train station in the world. The station was used by an average of 3.64 million people per day. That’s 1.3 billion a year. Or a fifth of humanity. Shinjuku has 36 platforms, and connects 12 different subway and railway lines. Morning rush hour is pandemonium with all trains 200% full.