It was like Grand Central Station in New York, but much busier. You could not even go down the stairs when the people were trying to come up. But don't wait too long. Another train is coming in a few seconds. I read that Shinjuku is the busiest train station in this very busy city and I can believe it.
People rush off of one train and right on to another.
Everything is synchronized so that everyone does not have to wait too long. Down in the subway, it was just as packed. There are special yellow and white boxes marked on the platform. I didn't understand why until today. When waiting for a subway you stand in the large white box.