Architectural detail of Grand Central Terminal (GCT) (Grand Central Station) (Grand Central), a commuter rail terminal, third busiest of North America, Midtown Manhattan, New York City, United States of America, North America

Argentina, South America

Argentina, South America

Commuters inside a train of the MTR of Hong Kong, the most popular mean of transportation in the city, China

Hands holding hanging round handles in a subway car, Tokyo, Japan.

Commuters on their way home on Beijing's subway, China.

Man standing in subway car full of people, Tokyo, Japan

Subway underground on tracks beside tiled wall, Manhattan; New York City, New York, United States of America

Empty subway car, San Francisco, California, United States of America

Handles on Mass Transit Vehicle, Beijing, China

Interior of subway train, New York City, New York, United States

Interior of subway train, New York City, New York, United States

Subway train and platform, New York City, New York, United States

Interior of subway train, New York City, New York, United States

Subway train, New York City, New York, United States