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Profile of Harlem River Tunnel and approaches; section of Harlem River Tunnel during construction.
Organization. Hudson pressure tunnel. Mayor William J. Gaynor firing blast to connect East and West headings. In group, left to right, are Consulting Engineer John R. Freeman, Commissioner Charles Strauss, Chief Engineer J. Waldo Smith, Mayor Willian J. Gaynor and Commissioner John F. Galvin. Contract 90. January 30, 1912.

Organization. Hudson pressure tunnel. Mayor William J. Gaynor firing b...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. ... Contract 47. May 25, 1910.

Wallkill pressure tunnel. ... Contract 47. May 25, 1910.

Picryl description: Public domain image of a construction site, works, 20th-century industrial architecture, free to use, no copyright restrictions.

Yonkers pressure tunnel.  Contract 54. November 21, 1913.

Yonkers pressure tunnel. Contract 54. November 21, 1913.

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Borings. Hand core-boring rig at work on line of Wallkill pressure tunnel. August 31, 1906.

Borings. Hand core-boring rig at work on line of Wallkill pressure tun...

Public domain photo of a monument, historic place, 19th century, free to use, no copyright restrictions image - Picryl description.

Yonkers pressure tunnel.  Finished lining in foreground. Placing concrete in side-walls and arch in background. ... Contract 54. May 1, 1912.

Yonkers pressure tunnel. Finished lining in foreground. Placing concr...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Croton Lake pressure tunnel. ... Contract 24. October 3, 1913.

Croton Lake pressure tunnel. ... Contract 24. October 3, 1913.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Elmsford tunnel. Timbering near North portal. Bench not excavated. Contract 52. April 25, 1912.

Elmsford tunnel. Timbering near North portal. Bench not excavated. Con...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Attempt of blowing up the train from Nashville to Stevenson by means of torpedoes on the R.R. truck in the Cumberland tunnel. . . .Oct. 25-26, 1863

Attempt of blowing up the train from Nashville to Stevenson by means o...

Picryl description: Public domain historical book on American Civil War, free to use, no copyright restrictions image.

East end of tunnel, showing bed of road.

East end of tunnel, showing bed of road.

Picryl description: Public domain image of a quarry, mine, excavation, or mining site, free to use, no copyright restrictions.

View of tunnel, E.R.R. Massachusetts stereoscope card collection, NYPL

View of tunnel, E.R.R. Massachusetts stereoscope card collection, NYPL

Picryl description: Public domain image of a locomotive, train cars, railroad tracks, railway, 19th-20th century, free to use, no copyright restrictions.

Black Rock Tunnel, near Phoenixville. Philadelphia Reading Railroad. Stereoscope card.

Black Rock Tunnel, near Phoenixville. Philadelphia Reading Railroad. S...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

View in Fairmount Park. Tunnel. Stereoscope card, 19th century Philadelpia PA.

View in Fairmount Park. Tunnel. Stereoscope card, 19th century Philade...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

West End Tunnel No. 3. 19th century stereoscope card. Utah.

West End Tunnel No. 3. 19th century stereoscope card. Utah.

Utah stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembl... More

Tunnel No. 2, Echo Cañon, U.P.R.R. [Union Pacific Railroad].

Tunnel No. 2, Echo Cañon, U.P.R.R. [Union Pacific Railroad].

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Crested Peak and Tunnel no. 10, eastern slope of western summit.

Crested Peak and Tunnel no. 10, eastern slope of western summit.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

East entrance to Mullen Tunnel. [Men working at the entrance to the tunnel.]

East entrance to Mullen Tunnel. [Men working at the entrance to the tu...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

View from tunnel 3. 19th century stereoscope card. Utah.

View from tunnel 3. 19th century stereoscope card. Utah.

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

Index [Finger] Rock, Upper Weber Canyon, near Tunnel No. 3. Union Pacific Railroad.

Index [Finger] Rock, Upper Weber Canyon, near Tunnel No. 3. Union Paci...

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

West Portal, Hoosac Tunnel, North Adams, Mass.

West Portal, Hoosac Tunnel, North Adams, Mass.

Public domain photo of vintage Massachusetts postcard, free to use, no copyright restrictions image - Picryl description

Timber-shored tunnel into mine, San Juan County, Colorado. Much timber is required in mine tunnel construction and mill work

Timber-shored tunnel into mine, San Juan County, Colorado. Much timber...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Railroad tunnel. Lancaster PA. 19th century stereoscope card.

Railroad tunnel. Lancaster PA. 19th century stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Superstructures. Breakneck Gaging chamber, located south of Breakneck grade tunnel, in Putnam county, N.Y. Contracat 109. August 29, 1916.

Superstructures. Breakneck Gaging chamber, located south of Breakneck ...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. Transition section from cut-and-cover aqueduct to Downtake shaft. .. Contract 47. June 19, 1912.

Wallkill pressure tunnel. Transition section from cut-and-cover aquedu...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Wallkill  pressure tunnel. End view of section of concrete lining with invert laid in foreground. Erection forms in progress  in background. Contract 47. April 11, 1911.

Wallkill pressure tunnel. End view of section of concrete lining with...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Hudson pressure tunnel. Fourteen-foot cast-steel dome for Drainage shaft showing method of stressing anchor-bolts. Contract  90. February 19, 1914.

Hudson pressure tunnel. Fourteen-foot cast-steel dome for Drainage sha...

Picryl description: Public domain image of a construction site, works, 20th-century industrial architecture, free to use, no copyright restrictions.

Bonticou grade tunnel.  South portal completed. Note stone boundary walls. Contract 47. August 23, 1917.

Bonticou grade tunnel. South portal completed. Note stone boundary wa...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... Contract 47. June 9, 1911.

Bonticou tunnel. Competed trimming of tunnel shown in foreground. ... ...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Hudson pressure tunnel. View looking east across Hudson river towards Breakneck mountain with plant at East test-shaft at base of mountain. Contract 90. May 28, 1909.

Hudson pressure tunnel. View looking east across Hudson river towards ...

Picryl description: Public domain image of a landscape with water, mountains, and sky, free to use, no copyright restrictions.

Hudson pressure tunnel. Intrerior of temporary superstructure over Drainage shaft showing gas-engine hoist and switchboard on right, ... Contract 90. August 31, 1914.

Hudson pressure tunnel. Intrerior of temporary superstructure over Dra...

Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.

Hoosac Tunnel, west end of the double track.

Hoosac Tunnel, west end of the double track.

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

View of the cascade 200 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of the cascade 200 feet high, 1-4 mile up the creek, to the right...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

View of the cascade 125 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of the cascade 125 feet high, 1-4 mile up the creek, to the right...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Interior of Railway Suspension Bridge, 800 feet long.

Interior of Railway Suspension Bridge, 800 feet long.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Pennsylvania Railroad, Spruce Creek tunnel. Stereoscope card.

Pennsylvania Railroad, Spruce Creek tunnel. Stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Pennsylvania Railroad, The Allegheny Tunnel. Stereoscope card.

Pennsylvania Railroad, The Allegheny Tunnel. Stereoscope card.

Picryl description: Public domain image of a train station, railroad tracks, railway, 19th-20th century, free to use, no copyright restrictions.

East from Mullen Tunnel Grade [coach on the road].

East from Mullen Tunnel Grade [coach on the road].

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

East from Mullen Tunnel Grade [coach on the road].

East from Mullen Tunnel Grade [coach on the road].

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

The Famous Wawona Tree Tunnel and Coach, Cal.

The Famous Wawona Tree Tunnel and Coach, Cal.

California Stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who a... More

View looking from within the tunnel into the station.
The Tunnel, River Drive, Philadelphia, Pa.

The Tunnel, River Drive, Philadelphia, Pa.

Public domain photo of vintage Pennsylvania postcard, 19th century, free to use, no copyright restrictions image - Picryl description.

Tunnel, [railroad underpass] White Hall, N.Y.

Tunnel, [railroad underpass] White Hall, N.Y.

Public domain image of a large historic building, city hall, urban architecture, free to use, no copyright restrictions - Picryl description

Entrance to tunnel, west end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, west end. Massachusetts stereoscope card collectio...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Showing concrete over iron work - Harlem River Tunnel.

Showing concrete over iron work - Harlem River Tunnel.

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Rondout pressure tunnel. Placing concrete in excavated mud seam in the rock above the tunnel lining. Contract 12. July 20, 1911.

Rondout pressure tunnel. Placing concrete in excavated mud seam in the...

Picryl description: Public domain image of a basement, underground, lobby, free to use, no copyright restrictions.

Bull Hill tunnel. View showing timbering in place. ... Contract 22. November 5, 1909.

Bull Hill tunnel. View showing timbering in place. ... Contract 22. No...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

City tunnel. Steel diaphragm at tunnel end of drainage drift showing 8-foot opening to drift. ...  Contract 67. September 17, 1914.

City tunnel. Steel diaphragm at tunnel end of drainage drift showing 8...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Rondout pressure tunnel.  Section of tunnel with finished concrete lining in place. Note grout hole in arch key. Contract 12. October 6, 1910.

Rondout pressure tunnel. Section of tunnel with finished concrete lin...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Interior of the snow sheds on the C.P.R.R.

Interior of the snow sheds on the C.P.R.R.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Entrance to tunnel, west end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, west end. Massachusetts stereoscope card collectio...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Pennsylvania Railroad, The Allegheny Tunnel. Stereoscope card.

Pennsylvania Railroad, The Allegheny Tunnel. Stereoscope card.

Picryl description: Public domain image of a train station, railroad tracks, railway, 19th-20th century, free to use, no copyright restrictions.

Mullen Tunnel Grade east approach [showing log cabin at the bottom of grade.]

Mullen Tunnel Grade east approach [showing log cabin at the bottom of ...

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Bend of the Weber, Upper Weber Kanyon, near Tunnel no. Three looking, east.

Bend of the Weber, Upper Weber Kanyon, near Tunnel no. Three looking, ...

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

Observatory and Tunnel. New York Sterecope Card.

Observatory and Tunnel. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Tunnel at Summit Station, Pa. Catawissa Railroad Company. Pennsylvania.

Tunnel at Summit Station, Pa. Catawissa Railroad Company. Pennsylvania...

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

City tunnel. Interior of temporary superstructure over Shaft 11 showing discharge pipe from float at left, telescope with crane in center, and at right traveling crane above and cable reel below. Contracts 140 and 166. January 5, 1917.

City tunnel. Interior of temporary superstructure over Shaft 11 showin...

Public domain photograph related to New York City, free to use, no copyright restrictions image - Picryl description

Hudson River Vehicular Tunnel [Holland Tunnel]
Map of routes to the Holland Tunnel.

Map of routes to the Holland Tunnel.

Public domain image of the vintage map from NYPL Lionel Pincus and Princess Firyal Map Division, free to use, no copyright restrictions image. The Lionel Pincus and Princess Firyal Map Division is one of the wo... More

State Line Tunnel, Berkshire Hills, Massachusetts

State Line Tunnel, Berkshire Hills, Massachusetts

Public domain photo of vintage Massachusetts postcard, free to use, no copyright restrictions image - Picryl description

Interior of Railway Suspension Bridge, 800 feet long.

Interior of Railway Suspension Bridge, 800 feet long.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunnel.]

[...] approach Mullen Tunnel. [Men working at entrance to Mullen Tunne...

Public domain image of a train station, free to use, no copyright restrictions - Picryl description

Rondout pressure tunnel. Steel arch forms mounted on traveler with plates removed to permit placing of concrete in haunches. Contract 12. October 10, 1910.

Rondout pressure tunnel. Steel arch forms mounted on traveler with pla...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Wallkill pressure tunnel. View showing completed concrete side-wall. Note key in concrete. Contract 47. June 7, 1911.

Wallkill pressure tunnel. View showing completed concrete side-wall. N...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Toltec tunnel from across the gorge.

Toltec tunnel from across the gorge.

Colorado stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

La Salle St. tunnel, Chicago. Chicago Stereoscope Card Collection

La Salle St. tunnel, Chicago. Chicago Stereoscope Card Collection

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

[Raton tunnel on the A.T. & S.F. R.R. N.M.]

[Raton tunnel on the A.T. & S.F. R.R. N.M.]

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Central Park, the Tunnel. New York Sterecope Card.

Central Park, the Tunnel. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

The Tunnel. New York Sterecope Card.

The Tunnel. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

Railroad suspension bridge, &c. New York Sterecope Card.

Railroad suspension bridge, &c. New York Sterecope Card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel, Havana Glen. New York Sterecope Card.

Tunnel, Havana Glen. New York Sterecope Card.

New York stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who ass... More

In the tunnel of a coal mine, Pittsburg, Penn'a.

In the tunnel of a coal mine, Pittsburg, Penn'a.

Picryl description: Public domain image of a coal mine, mining, free to use, no copyright restrictions.

Pennsylvania Railroad, Columbia Tunnel. Stereoscope card.

Pennsylvania Railroad, Columbia Tunnel. Stereoscope card.

Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Pennsylvania Railroad, Allegheny Tunnel. Stereoscope card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Tunnel at Summit Station, Pa. Catawissa Railroad Company. Pennsylvania.

Tunnel at Summit Station, Pa. Catawissa Railroad Company. Pennsylvania...

Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description

Flat Rock tunnel, Reading R.R., length 940 feet.

Flat Rock tunnel, Reading R.R., length 940 feet.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Bend of the Weber, Upper Weber Kanyon, near Tunnel No. Three, looking east.

Bend of the Weber, Upper Weber Kanyon, near Tunnel No. Three, looking ...

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

The Famous Wawona Tree Tunnel and Coach, Cal.

The Famous Wawona Tree Tunnel and Coach, Cal.

California Stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who a... More

The Narrows Tunnel: chart of borings.

The Narrows Tunnel: chart of borings.

Public domain scan of a plan, map, architecture drawing, or diagram, free to use, no copyright restrictions - Picryl description.

Second Tunnel, Grand River Canyon, Colo.

Second Tunnel, Grand River Canyon, Colo.

Picryl description: Public domain photo of vintage Colorado postcard, free to use, no copyright restrictions image.

The "N.C.Munson," first engine through Hoosac tunnel, February 9th, 1875.

The "N.C.Munson," first engine through Hoosac tunnel, February 9th, 18...

Picryl description: Public domain image of a locomotive, train cars, railroad tracks, railway, 19th-20th century, free to use, no copyright restrictions.

Lowell water works tunnel. Lowell, Massachusetts. Stereoscope card.

Lowell water works tunnel. Lowell, Massachusetts. Stereoscope card.

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Pennsylvania Railroad, Carr’s Tunnel. Stereoscope card.

Pennsylvania Railroad, Carr’s Tunnel. Stereoscope card.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

West End Tunnel No. 3. 19th century stereoscope card. Utah.

West End Tunnel No. 3. 19th century stereoscope card. Utah.

Utah stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who assembl... More

Entrance to tunnel, west end. Massachusetts stereoscope card collection, NYPL

Entrance to tunnel, west end. Massachusetts stereoscope card collectio...

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Hudson pressure tunnel. Corrugated pipe columns in position at top of Drainage shaft. The three columns not corrugated indicate location of blow-off nozzle. Contract 90. October 20, 1913.

Hudson pressure tunnel. Corrugated pipe columns in position at top of ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Superstructures. View of Drainage chamber of Wallkill pressure tunnel. ... Contract 117. July 6, 1916.

Superstructures. View of Drainage chamber of Wallkill pressure tunnel....

Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description

Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel crossing of the Hudson river. June 26, 1908.

Borings. Dimond drill mounted on platform at Hudson Pressure Tunnel cr...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Organization. City tunnel. Mayor John Purroy Mitchel switching on current to celebrate the excavation of the last heading of the City tunnel. Contract 65. Junuary 12, 1914.

Organization. City tunnel. Mayor John Purroy Mitchel switching on curr...

Public domain photograph of the train tunnel, railroad, train track, free to use, no copyright restrictions image - Picryl description

Yonkers pressure tunnel.  Contract 54. September 25, 1914.

Yonkers pressure tunnel. Contract 54. September 25, 1914.

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Camps. Croton Lake pressure tunnel. ... Contract 24. May 6, 1910.

Camps. Croton Lake pressure tunnel. ... Contract 24. May 6, 1910.

Public domain photograph of mountains, winter, snow, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. View showing chamber over Shaft 1 with completed grading. Contract 47. June 19, 1912.

Wallkill pressure tunnel. View showing chamber over Shaft 1 with compl...

Public domain scan of artwork related to technological or industrial history, free to use, no copyright restrictions image - Picryl description

Wallkill pressure tunnel. View showing full-section steel forms in place. The concrete is placed in one operation. Contract 47. June 8, 1911.

Wallkill pressure tunnel. View showing full-section steel forms in pla...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

Borings. Testing porosity of rock on site of Rondout pressure tunnel. June 7, 1907.

Borings. Testing porosity of rock on site of Rondout pressure tunnel. ...

Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description

Bonticou tunnel. Erecting steel area arch forms for concreting. .. Contract  47. April 12, 1911.

Bonticou tunnel. Erecting steel area arch forms for concreting. .. Con...

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

San Fernando Tunnel. Sterescope Cards NYPL Collection.

San Fernando Tunnel. Sterescope Cards NYPL Collection.

California Stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who a... More

West portal of tunnel, sec. 8. - stereoscopic view, public domain photorpaph

West portal of tunnel, sec. 8. - stereoscopic view, public domain phot...

Boston Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yo... More

Hoosac Tunnel, Mass. Massachusetts stereoscope card collection, NYPL

Hoosac Tunnel, Mass. Massachusetts stereoscope card collection, NYPL

Massachusetts stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker wh... More

Hoosac Tunnel, east portal and mountain.

Hoosac Tunnel, east portal and mountain.

Public domain photograph of a mountain pass, mountains, nature, mountain range, view, landscape, rocks, free to use, no copyright restrictions - Picryl description

The entrance of the Shawangunk Tunnel, on the west side.

The entrance of the Shawangunk Tunnel, on the west side.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Interior of Railway Suspension Bridge, 800 feet long.

Interior of Railway Suspension Bridge, 800 feet long.

Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.

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