Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Erie Railway, Delaware Division, Bridge 110.54, Spanning Lackawaxen Ri...
Significance: The former Erie Railroad bridge over the Lackawaxen River is significant as a late nineteenth-century truss structure remaining in main-line service, and as the work of a major bridge-building com... More
Pennsylvania Railroad, Delaware River Bridge, Spanning Delaware River,...
Significance: The crossing is a critical link in the railroad route from Philadelphia to New York, and has hosted a series of bridges dating back to 1806. The current bridge is one of the Pennsylvania Railroad'... More
Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...
Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More
Pennsylvania Railroad, Manayunk Bridge, Spanning Schuylkill Expressway...
Significance: The bridge's nine open-spandrel reinforced concrete arches follow an unusual reverse curvature, which earns it the nickname "S-bridge." Towering over the town of Manayunk and the Schuylkill Expres... More
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Pennsylvania Railroad, Trenton Cut-Off, Bridge No. 25 at Earnest, Span...
Significance: The bridge is significant for its association with the Pennsylvania Railroad's Trenton Cut-Off, an early low-grade freight line around Philadelphia. Unprocessed Field note material exists for thi... More
Philadelphia & Reading Railroad, Bridge at West Falls, Spanning Schuyl...
See also HAER PA-39 for related documentation. Includes photographs & written data. Significance: The Philadelphia & Reading Railroad's second bridge at West Falls complements the adjacent Falls Bridge (1854) i... More
Pennsylvania Railroad, Granville Bridge, Spanning Juniata River, 1.25 ...
Significance: The bridge is significant as a well-preserved example of a medium-length stone arch bridge, representing the Pennsylvania Railroad's monumental capitol investment and desire for "permanent" struct... More
Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...
Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Pittsburgh & Lake Erie Railroad, Ohio River Bridge, Spanning Ohio Rive...
Significance: The bridge is significant for its relatively long and heavy cantilever truss, planned shortly before the Quebec cantilever bridge collapse of 1907. Rather than select a different design, the railr... More
Davis Island Dam & Lock No. 1, Ohio River, mile 4.7 on right bank, Pit...
Includes index to related materials in National Archives RG 77. Significance: As the first lock and dam on the Ohio River, the Davis Island Lock and Dam was an experimental project testing the skills of the 19t... More
Pennsylvania Railroad, French Creek Trestle, Spanning French Creek, no...
Significance: With its sixteen plate-girder spans of various ages, is an excellent example of American railroads' practice of recycling main-line structures into branches and sidings. Unprocessed Field note ma... More
Philadelphia & Reading Railroad, Wissahickon Creek Viaduct, Spanning W...
Significance: The Wissahickon Creek Viaduct marks the beginning of a resurgence in major stone arch bridge construction on American railroads after the panic of 1873. Unprocessed Field note material exists for... More
Philadelphia & Reading Railroad, Pedestrian Suspension Bridge, Foot of...
See also HAER PA-121 for related documentation. Includes photographs. Significance: The Philadelphia & Reading Railroad's pedestrian suspension bridge was typical of short spans produced by the John A. Roebling... More
Lehigh Valley Railroad, Delaware River Bridge, Spanning Delaware River...
Significance: This structure occupies the piers of the first railroad bridge to cross the Delaware River at Easton. It is also notable for its fish-belly deck trusses, an unusual variant of the Pratt design. U... More
Philadelphia & Reading Railroad, Mule Bridge, Spanning Schulykill Rive...
Significance: The bridge is one of Philadelphia's oldest metal railroad bridges, and a rare surviving example of a wrought-iron lattice truss. Survey number: HAER PA-552 Building/structure dates: 1889 Initial... More
Philadelphia & Reading Railroad, Mule Bridge, Spanning Schulykill Rive...
Significance: The bridge is one of Philadelphia's oldest metal railroad bridges, and a rare surviving example of a wrought-iron lattice truss. Survey number: HAER PA-552 Building/structure dates: 1889 Initial... More
Pennsylvania Railroad, West Brownsville Junction Bridge, Spanning Mono...
Significance: This bridge's 401'-long Petit through truss is typical of long spans required on Monongahela River navigation. Its approaches feature an early installation of a reinforced concrete slab floor. Un... More
Scarlets Mill Bridge, Spanning former Reading Railroad, Scarlets Mill,...
Significance: The Scarlets Mill Bridge is a cast- and wrought-iron Pratt-type truss with a rolled upper chord arched in the form of an ellipse, one of many built in the 1870s and 1880s for the Philadelphia and ... More
Scarlets Mill Bridge, Spanning former Reading Railroad, Scarlets Mill,...
Significance: The Scarlets Mill Bridge is a cast- and wrought-iron Pratt-type truss with a rolled upper chord arched in the form of an ellipse, one of many built in the 1870s and 1880s for the Philadelphia and ... More
Connecting Railway, Reading Railroad Overpass, Amtrak Northeast Corrid...
Significance: This overpass, one of the early grad-separation structures on Philadelphia's Connecting Railway retains its original brick arches, which are rarely found on U.S. railroads. The bridge is located i... More
New York, Chicago & St. Louis Railroad, Elk Creek Trestle, Spanning El...
Significance: The crossing is an excellent example of the long trestles required to cross northwestern Pennsylvania's irregular topography. Unprocessed Field note material exists for this structure: N607 Surv... More
Pennsylvania Railroad, Allegheny Tunnel, Beneath Allegheny Mountain, e...
Significance: It is an example of a mid-19th century railroad tunnel featuring ashlar masonry portals and a brick arch lining. Upon completion it was the longest railroad tunnel in America, allowing railcars to... More
Pennsylvania & New Jersey Railroad, Delaware River Bridge, Spanning De...
Significance: Because of its location on the lower Delaware River, the bridge has a collection of extremely long and heavy spans. These include the world's heaviest center-bearing swing span, completed in 1896,... More
Pennsylvania & New Jersey Railroad, Delaware River Bridge, Spanning De...
Significance: Because of its location on the lower Delaware River, the bridge has a collection of extremely long and heavy spans. These include the world's heaviest center-bearing swing span, completed in 1896,... More
Pennsylvania & New Jersey Railroad, Delaware River Bridge, Spanning De...
Significance: Because of its location on the lower Delaware River, the bridge has a collection of extremely long and heavy spans. These include the world's heaviest center-bearing swing span, completed in 1896,... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Monongahela Railway Company Shops, Water Street & Seventeenth Street, ...
Significance: The Monongahela Railway Company Shops reflect the support needs of a railroad significant in the coal, coke, and steel industries of Southwest Pennsylvania in the twentieth century, particularly i... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, 52nd Street Bridge, North Fifty-second Street a...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...
Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More
Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...
Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Philadelphia & Reading Railroad, Delaware River Bridge, Spanning Delaw...
Significance: The bridge, an early, large-scale reinforced concrete structure, is a significant example of its type because of several unusual details. Its closed-spandrel arches are rife with expansion joints ... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Philadelphia & Reading Railroad, Bridge at West Falls, Spanning Schuyl...
See also HAER PA-39 for related documentation. Includes photographs & written data. Significance: The Philadelphia & Reading Railroad's second bridge at West Falls complements the adjacent Falls Bridge (1854) i... More
Central Railroad of New Jersey, Lehigh River Bridge at Easton, Spannin...
Significance: This skewed crossing of the Lehigh River, with one span over the Third Street Bridge, is significant as a highly visible local landmark. When the structure partially collapsed during a 1902 flood,... More
Central Railroad of New Jersey, Lehigh River Bridge at Easton, Spannin...
Significance: This skewed crossing of the Lehigh River, with one span over the Third Street Bridge, is significant as a highly visible local landmark. When the structure partially collapsed during a 1902 flood,... More
Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...
Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More
Philadelphia & Reading Railroad, Mill Creek Bridge, Spanning Mill Cree...
Significance: This structure is significant as a well-preserved example among dozens of stone arch bridges built along the Philadelphia & Reading Railroad during the mid-19th century, and one of few with a curv... More
Pennsylvania Railroad, Pickering Creek Trestle, Spanning Pickering Cre...
Significance: The trestle is significant as a high trestle with both horizontal and vertical curvature. Unprocessed Field note material exists for this structure: N596 Survey number: HAER PA-521 Building/str... More
Pennsylvania Railroad, Pickering Creek Trestle, Spanning Pickering Cre...
Significance: The trestle is significant as a high trestle with both horizontal and vertical curvature. Unprocessed Field note material exists for this structure: N596 Survey number: HAER PA-521 Building/str... More
Pennsylvania Railroad, Brandywine Valley Viaduct, Spanning Brandywine ...
Significance: It is notable for its height, length, and complex geometry, which includes both horizontal and vertical curvature. It is also significant in association with the Pennsylvania Railroad's Philadelph... More
Pennsylvania Railroad, Whitford Bridge, Spanning Amtrak tracks at Whit...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Pennsylvania Railroad, Whitford Bridge, Spanning Amtrak tracks at Whit...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Pittsburgh & Lake Erie Railroad, Ohio River Bridge, Spanning Ohio Rive...
Significance: The bridge is significant for its relatively long and heavy cantilever truss, planned shortly before the Quebec cantilever bridge collapse of 1907. Rather than select a different design, the railr... More
Lehigh Valley Railroad, Delaware River Bridge, Spanning Delaware River...
Significance: This structure occupies the piers of the first railroad bridge to cross the Delaware River at Easton. It is also notable for its fish-belly deck trusses, an unusual variant of the Pratt design. U... More
Philadelphia & Reading Railroad, Mule Bridge, Spanning Schulykill Rive...
Significance: The bridge is one of Philadelphia's oldest metal railroad bridges, and a rare surviving example of a wrought-iron lattice truss. Survey number: HAER PA-552 Building/structure dates: 1889 Initial... More
Philadelphia & Reading Railroad, Mule Bridge, Spanning Schulykill Rive...
Significance: The bridge is one of Philadelphia's oldest metal railroad bridges, and a rare surviving example of a wrought-iron lattice truss. Survey number: HAER PA-552 Building/structure dates: 1889 Initial... More
Philadelphia & Reading Railroad, Manatawny Creek Bridge, Spanning Mana...
Significance: The bridge is typical of dozens of stone arch bridges built along the Philadelphia & Reading Railroad during the mid-19th century. This particular example demonstrates how the railroad used reinfo... More
Pennsylvania Railroad, Safe Harbor Bridge, Spanning mouth of Conestoga...
Significance: The bridge is unusual two-level structure built to carry two different Pennsylvania Railroad branches. The low-grade freight line on the upper level was chief engineer William H. Brown's last majo... More
Pennsylvania Railroad, Safe Harbor Bridge, Spanning mouth of Conestoga...
Significance: The bridge is unusual two-level structure built to carry two different Pennsylvania Railroad branches. The low-grade freight line on the upper level was chief engineer William H. Brown's last majo... More
Pennsylvania Railroad, West Brownsville Junction Bridge, Spanning Mono...
Significance: This bridge's 401'-long Petit through truss is typical of long spans required on Monongahela River navigation. Its approaches feature an early installation of a reinforced concrete slab floor. Un... More
Scarlets Mill Bridge, Spanning former Reading Railroad, Scarlets Mill,...
Significance: The Scarlets Mill Bridge is a cast- and wrought-iron Pratt-type truss with a rolled upper chord arched in the form of an ellipse, one of many built in the 1870s and 1880s for the Philadelphia and ... More
Connecting Railway, Reading Railroad Overpass, Amtrak Northeast Corrid...
Significance: This overpass, one of the early grad-separation structures on Philadelphia's Connecting Railway retains its original brick arches, which are rarely found on U.S. railroads. The bridge is located i... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Delaware, Lackawanna & Western Railroad, Scranton Yards, Lackawanna Av...
Significance: The Scranton yards of the D,L & W Railroad are representative of twentieth-century steam-era facilities. Many structures remain from the administration of D,L & W President William H. Truesdale, ... More
Monongahela Railway Company Shops, Water Street & Seventeenth Street, ...
Significance: The Monongahela Railway Company Shops reflect the support needs of a railroad significant in the coal, coke, and steel industries of Southwest Pennsylvania in the twentieth century, particularly i... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Pennsylvania Railroad, West Philadelphia Elevated, Parallel to Schuylk...
See also HAER PA-71 for related documentation. Includes photographs. Significance: The West Philadelphia Elevated, part of the Pennsylvania Railroad's program to separate passenger and freight traffic, includes... More
Erie Railway, Delaware Division, Bridge 110.54, Spanning Lackawaxen Ri...
Significance: The former Erie Railroad bridge over the Lackawaxen River is significant as a late nineteenth-century truss structure remaining in main-line service, and as the work of a major bridge-building com... More
Pennsylvania Railroad, Delaware River Bridge, Spanning Delaware River,...
Significance: The crossing is a critical link in the railroad route from Philadelphia to New York, and has hosted a series of bridges dating back to 1806. The current bridge is one of the Pennsylvania Railroad'... More
Pennsylvania Railroad, 52nd Street Bridge, North Fifty-second Street a...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...
Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More
Conrail Port Perry Bridge, Spanning Monongahela River, Port Perry, All...
Part of the Monongahela River Recording Project, which included HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAER PA-304, Lower Monongahela Rive... More
Pennsylvania Railroad, 25th Street Elevated, Above South Twenty-fifth ...
Significance: This elevated urban freight railroad is unusual for its great length and alignment directly over a city street. Survey number: HAER PA-549 Building/structure dates: 1926-1928 Initial Construction
Philadelphia & Reading Railroad, Delaware River Bridge, Spanning Delaw...
Significance: The bridge, an early, large-scale reinforced concrete structure, is a significant example of its type because of several unusual details. Its closed-spandrel arches are rife with expansion joints ... More
Philadelphia & Reading Railroad, Peacock's Lock Viaduct, Spanning Schu...
Significance: The Peacock's Lock Viaduct, named after a nearby lock on the Schuylkill Division Canal, may be the only masonry arch bridge in the U.S. with pierced spandrels. The circular openings between arche... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Monongahela Railroad, New Geneva Bridge, Spanning Monongahela River, S...
Significance: The bridge at New Geneva is significant for its long Petit through through truss, and more importantly, for its erection by end manufacturing. At the time of its construction, it was the longest a... More
Pennsylvania Railroad, Trenton Cut-Off, Bridge No. 25 at Earnest, Span...
Significance: The bridge is significant for its association with the Pennsylvania Railroad's Trenton Cut-Off, an early low-grade freight line around Philadelphia. Unprocessed Field note material exists for thi... More
Pennsylvania Railroad, Trenton Cut-Off, Bridge No. 25 at Earnest, Span...
Significance: The bridge is significant for its association with the Pennsylvania Railroad's Trenton Cut-Off, an early low-grade freight line around Philadelphia. Unprocessed Field note material exists for thi... More
Pennsylvania Railroad, Trenton Cut-Off, Bridge No. 25 at Earnest, Span...
Significance: The bridge is significant for its association with the Pennsylvania Railroad's Trenton Cut-Off, an early low-grade freight line around Philadelphia. Unprocessed Field note material exists for thi... More
Pennsylvania Railroad, Trenton Cut-Off, Bridge No. 25 at Earnest, Span...
Significance: The bridge is significant for its association with the Pennsylvania Railroad's Trenton Cut-Off, an early low-grade freight line around Philadelphia. Unprocessed Field note material exists for thi... More
Connecting Railway, Schuylkill River Bridge, Spanning Schuylkill River...
See also HABS PA-6213 for additional documentation. Includes photographs. See also HAER PA-71 for related documentation. Includes photographs. Significance: Completed in 1867, the Connecting Railway's Schuylkil... More
Connecting Railway, Schuylkill River Bridge, Spanning Schuylkill River...
See also HABS PA-6213 for additional documentation. Includes photographs. See also HAER PA-71 for related documentation. Includes photographs. Significance: Completed in 1867, the Connecting Railway's Schuylkil... More
Pennsylvania Railroad, Granville Bridge, Spanning Juniata River, 1.25 ...
Significance: The bridge is significant as a well-preserved example of a medium-length stone arch bridge, representing the Pennsylvania Railroad's monumental capitol investment and desire for "permanent" struct... More
Bessemer & Lake Erie Railroad, Allegheny River Bridge, Spanning Allegh...
Significance: The bridge was designed by two U.S. Steel subsidiaries - the railroad and the American Bridge Company - as a showpiece for their parent company. This structure not only introduced new silicon stee... More
Pennsylvania Railroad, Pickering Creek Trestle, Spanning Pickering Cre...
Significance: The trestle is significant as a high trestle with both horizontal and vertical curvature. Unprocessed Field note material exists for this structure: N596 Survey number: HAER PA-521 Building/str... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Philadelphia, Wilmington & Baltimore Railroad, Bridge No. 1, Spanning ...
Significance: Grays Ferry is the site of one of Philadelphia's oldest Schuylkill River bridges. The present swing span is typical of movable bridge construction at the turn of the 20th century. Survey number: ... More
Pennsylvania Railroad, Brandywine Valley Viaduct, Spanning Brandywine ...
Significance: It is notable for its height, length, and complex geometry, which includes both horizontal and vertical curvature. It is also significant in association with the Pennsylvania Railroad's Philadelph... More
Pennsylvania Railroad, Whitford Bridge, Spanning Amtrak tracks at Whit...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Pennsylvania Railroad, Whitford Bridge, Spanning Amtrak tracks at Whit...
Significance: The bridge's main span, a pin-connected Parker through truss, is an exceptionally long example of its type. Its length surpasses the practical limit of 300', beyond which a subdivided Pennsylvania... More
Pennsylvania Railroad, French Creek Trestle, Spanning French Creek, no...
Significance: With its sixteen plate-girder spans of various ages, is an excellent example of American railroads' practice of recycling main-line structures into branches and sidings. Unprocessed Field note ma... More