In our special four-part series of reports called "World of Motion," a team of CBS News correspondents traveled around the world to Japan, Greece, Southern Africa and Scotland to discover how and why people are on the move. In this installment, Ramy Inocencio rode the rails in Japan, while "CBS This Morning: Saturday" co-host Michelle Miller boarded trains here in the U.S., to see how American ingenuity stacks up to Japanese efficiency.

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