The Terminal Connection

http://www.hudsoncity.net/tubesenglish/hudsonterminalshowingundergroundsection-640.jpg
http://www.flickr.com/photos/40045986@N00/3093305042/in/set-72157610917034284/

http://www.hudsoncity.net/tubesenglish/5-stations.html,

http://www.nyc-architecture.com/GON/GON015.htm,
http://www.flickr.com/photos/40045986@N00/3128935431

Downtown_Hudson_Tubes: 

http://www.hudsoncity.net/tubes/downtowndetails.html,

WTC_(PATH_station)#Hudson_Terminal

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Grand_Central_Terminal: 

http://www.hudsoncity.net/tubesenglish/1-constructionhistory.html,

http://www.worldiki.com/blog/2008/01/29/grand-central-terminal,

http://grandcentralterminal.com/info/grandcentralterminal.cfm,

http://murrayhill.gc.cuny.edu/categories/subjects/grand-central-terminal-new-york-ny