'In 24 Hours': Track 61 and Grand Central's M42 | CNN Travel

VideoSearch Menu In 24 HoursSecrets of New York: Track 61 and Grand Central's M42Margaret Heidenry, for CNN • Updated 7th December 2015FacebookTwitterEmail (CNN) — An unmarked, nondescript door off Park Avenue in Midtown Manhattan leads down to a shadowy train tunnel with a storied past. It once covertly carried a United States president from Grand Central Terminal to the Waldorf Astoria hotel. Follow the tunnel today, and you'll find it still leads to the railroad car used by POTUS number...