It is not generally known but in each corner of Grand Central Terminal is an office tower, and walkways through the windows on the east and west side of the main terminal that connect them. In the southest corrner is a relatively obscure room called the Williamson Library that was created in 1934 that dates back to the days of the New York Central Railroad that still houses a collection of various railway artifacts and publications. The library is still operated and leased by a local organization (http://www.nyrre.org/williams.htm) from Metro North Railroad.
Below is an indication of where in the window passages the following photos were taken, along with various views from the upper walkway and the library looking down into the terminal. I was told that the 20th Century LImited red carpet is an original, has appeared on the National Geographic channel, and was used at the gate in GCT on the daily train from Chicago.
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