Union Station Union Station is a Chicago train station that opened in 1925, replacing an earlier 1881 station, and is now the only intercity rail terminal in Chicago. Union Station was built on the west side of the Chicago River and stands between Adams Street and Jackson Street. The station's ornate Beaux-Arts main waiting room, the "Great Hall", is one of the United States' great interior public spaces with its vaulted skylight, statuary, and connecting lobbies, staircases, and balconies. The Great Hall is over 110 feet (34 m) high. Enormous wooden benches are arranged in the room for travelers to wait for connections. During World War II, Union Station was at its busiest, handling as many as 300 trains and 100,000 passengers daily. **Source: Union Station Wikipedia