New York Tunnel Extension (English Wikipedia)

Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

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"Under the Hudson River by Tunnel About to Become a Reality; October 1 Will See the End of a Romance of Thirty-four Years' Struggle of Capital and Brains Against the Seemingly Insurmountable Obstacles of Nature". The New York Times. May 26, 1907. ISSN 0362-4331. Retrieved April 24, 2018.
"TROLLEY TUNNEL OPEN TO JERSEY; President Turns On Power for First Official Train Between This City and Hoboken. REGULAR SERVICE STARTS Passenger Trains Between the Two Cities Begin Running at Midnight. EXERCISES OVER THE RIVER Govs. Hughes and Fort Make Congratulatory Addresses -- Dinner at Sherry's in the Evening". The New York Times. February 26, 1908. Retrieved April 24, 2018.
"PENNSYLVANIA'S NEW PLANS OUTLINED; Big Improvements to be Made in Long Island's Acquisition. NO THOUGHT OF MONTAUK POINT Ferry Connection from Jersey City to Bay Ridge and Tunnels to Follow, an Official Says". The New York Times. May 8, 1900. Retrieved May 23, 2018.
"NORTH RIVER BRIDGE PLAN; Pennsylvania Road Negotiating with Banking Houses". The New York Times. June 26, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA'S TUNNEL UNDER NORTH RIVER; Property Already Acquired for the Great New York Terminal. TO PUSH THE CONSTRUCTION City Neighborhoods' to be Improved -- Depth of the Tunnel So Great Subways Will Not Be Obstructed". The New York Times. December 12, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA'S TUNNEL A SUBMERGED BRIDGE; New York Terminal to be a Magnificent Structure. DETAILED PLANS DISCLOSED Vice President Rea Credited with the Idea Which Will, Experts Believe, Advance the City's Interests to an Unparalleled Degree". The New York Times. December 13, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"MORE OPPOSITION TO PENNSYLVANIA'S BILL; Rapid Transit Commissioners Will Appear Against It. THEIR RIGHTS INFRINGED E.M. Shepard and A.B. Boardman, Counsel for Board, Say that It Af- fects That Body's Usefulness -- Mr. Cassatt's Views". The New York Times. March 21, 1902. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA TUNNEL FRANCHISE PASSED; Aldermen Approve the Grant by a Vote of 41 to 36 Borough President Cantor Speaks and Votes Against the Measure -- Excited Debate Before the Final Action. PENNSYLVANIA TUNNEL FRANCHISE PASSED". The New York Times. December 17, 1902. ISSN 0362-4331. Retrieved May 22, 2018.
"O'ROURKE WILL BUILD PENNSYLVANIA TUNNEL; New York Firm Gets Contract for North River Section. BRITISH TO BORE OTHER TUBE S. Pearson & Son, Limited, of London, the Successful Bidders for Work Under the East River". The New York Times. March 12, 1904. Retrieved May 23, 2018.
"THE PENNSYLVANIA OPENS ITS SECOND RIVER TUBE; A Real Experience Tramping Through the Bores. HEADINGS MEET EXACTLY Brief Ceremonies as the Engineers Pass the Shield of the New North River Section. THE PENNSYLVANIA OPENS ITS SECOND RIVER TUBE". The New York Times. October 10, 1906. Retrieved May 23, 2018.
"PENNSYLVANIA OPENS ITS GREAT STATION; First Regular Train Sent Through the Hudson River Tunnel at Midnight". The New York Times. November 27, 1910. ISSN 0362-4331. Retrieved May 23, 2018.
"FOURTH RIVER TUBE THROUGH; Last of Pennsylvania-Long Island Tunnels Connected -- Sandhogs Celebrate". The New York Times. March 19, 1908. Retrieved May 23, 2018.
"DAY LONG THRONG INSPECTS NEW TUBE; 35,000 Persons Were Carried on the First Day of Pennsylvania's Tunnel Service. ACCIDENT MARRED OPENING Morning Trains Delayed Two Hours by Broken Third Rail -- Some Complaints Over Extra Fare". The New York Times. September 9, 1910. Retrieved May 22, 2018.
"JERSEY CITY DEPOT CLOSED BY PENNSY; Trains to Exchange Plac Will Now Come Here". The New York Times. November 18, 1961. Retrieved May 26, 2018.
Bedingfield, Robert E. (April 1, 1976). "Conrail Takes Over Northeast's System". The New York Times. ISSN 0362-4331. Retrieved February 5, 2018.

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"Nearly Twenty Miles Through Tubes and Tunnels" (PDF). The New York Times. November 9, 1908. Retrieved February 27, 2011.
"Court Here Lets Railroads Consolidate Tomorrow; RAIL MERGER GETS FINAL CLEARANCE" (PDF). The New York Times. 1968. ISSN 0362-4331. Retrieved February 1, 2018.

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"B&O Railroad Museum".

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Schafer, Mike; Brian Solomon (2009) [1997]. Pennsylvania Railroad. Minneapolis, MN: Voyageur Press. pp. 61–64. ISBN 978-0-7603-2930-6. OCLC 234257275.
Cudahy, Brian J. (2002), Rails Under the Mighty Hudson (2nd ed.), New York: Fordham University Press, ISBN 978-0-82890-257-1, OCLC 911046235
"Under the Hudson River by Tunnel About to Become a Reality; October 1 Will See the End of a Romance of Thirty-four Years' Struggle of Capital and Brains Against the Seemingly Insurmountable Obstacles of Nature". The New York Times. May 26, 1907. ISSN 0362-4331. Retrieved April 24, 2018.
"NORTH RIVER BRIDGE PLAN; Pennsylvania Road Negotiating with Banking Houses". The New York Times. June 26, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA'S TUNNEL UNDER NORTH RIVER; Property Already Acquired for the Great New York Terminal. TO PUSH THE CONSTRUCTION City Neighborhoods' to be Improved -- Depth of the Tunnel So Great Subways Will Not Be Obstructed". The New York Times. December 12, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA'S TUNNEL A SUBMERGED BRIDGE; New York Terminal to be a Magnificent Structure. DETAILED PLANS DISCLOSED Vice President Rea Credited with the Idea Which Will, Experts Believe, Advance the City's Interests to an Unparalleled Degree". The New York Times. December 13, 1901. ISSN 0362-4331. Retrieved May 22, 2018.
"MORE OPPOSITION TO PENNSYLVANIA'S BILL; Rapid Transit Commissioners Will Appear Against It. THEIR RIGHTS INFRINGED E.M. Shepard and A.B. Boardman, Counsel for Board, Say that It Af- fects That Body's Usefulness -- Mr. Cassatt's Views". The New York Times. March 21, 1902. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA TUNNEL FRANCHISE PASSED; Aldermen Approve the Grant by a Vote of 41 to 36 Borough President Cantor Speaks and Votes Against the Measure -- Excited Debate Before the Final Action. PENNSYLVANIA TUNNEL FRANCHISE PASSED". The New York Times. December 17, 1902. ISSN 0362-4331. Retrieved May 22, 2018.
"PENNSYLVANIA OPENS ITS GREAT STATION; First Regular Train Sent Through the Hudson River Tunnel at Midnight". The New York Times. November 27, 1910. ISSN 0362-4331. Retrieved May 23, 2018.
"Court Here Lets Railroads Consolidate Tomorrow; RAIL MERGER GETS FINAL CLEARANCE" (PDF). The New York Times. 1968. ISSN 0362-4331. Retrieved February 1, 2018.
Bedingfield, Robert E. (April 1, 1976). "Conrail Takes Over Northeast's System". The New York Times. ISSN 0362-4331. Retrieved February 5, 2018.

youtube.com (Global: 9^th place; English: 13^th place)

Nowakowski, Patrick (April 24, 2017). Metro-North/LIRR Committee Meeting (Board meeting). Event occurs at 15:45. Retrieved April 29, 2017.

New York Tunnel Extension (English Wikipedia)

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