Each day, hundreds of thousands of people commute into and out of Grand Central Terminal in New York City. Thousands more eat at the station's restaurants and sip cocktails at its elegant bars. But Grand Central houses two secret areas few people ever see. Nine stories below the lowest floor sits a bunker known as M-42. It's rumored that during World War II, the bunker had guards with shoot-to-kill orders, for fear of sabotage while the station's trains were being used to ferry troops into and out of New York. Also below the elaborate station is Track 61, which is not on any train map. Track 61 was built for wealthy travelers arriving on private trains and has a freight elevator that rises to the garage level of the Waldorf-Astoria Hotel. The track's most frequent user was President Franklin Delano Roosevelt, who wore leg braces and used a wheelchair because of his polio. FDR's private train included a car specially outfitted to hold his Pierce-Arrow limousine. When he rode into Manhattan from his hometown of Hyde Park, N.Y., he would be driven in the limo off the train, into the freight elevator and right into the hotel. The clandestine entrance prevented the public from seeing the President's inability to walk.