Over the years, more railroad companies began to use Penn Station. During World War II, over 100 million people used the station every year. But as air travel began to rise and the Interstate Highway System was created, fewer and fewer people used the train. In 1963, the station was torn apart and a new one was built in its place, with Penn Plaza and Madison Square Garden built over it. The station reopened in 1968 and continues to be used today.