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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... 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 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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... 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
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
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, 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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... 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 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
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
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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... 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
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
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
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
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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... 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
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
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, 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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... 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
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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... 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
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
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
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
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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... More
Bell Avenue Bridge, Spanning Bell Avenue at Conrail Railroad, Pittsbur...
Significance: Constructed in 1880 to replace an earlier wooden structure, the bridge provided an overpass for Bell Avenue in the Borough of Carnegie, Pennsylvania. The twin sandstone arches represent a bridge t... 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
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
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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... 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
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
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, 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
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
New York, New Haven & Hartford Railroad, Automatic Signalization Syste...
Significance: This system is one of the few automatic semaphore signal installations still in use on a major railroad in the United States. It was a major element in the first large-scale application of high-v... More
Philadelphia & Reading Railroad, Skew Arch Bridge, North Sixth Street ...
See also HABS PA-1025 for additional documentation. Includes photographs. See also HAER PA-117 for additional documentation. Significance: This structure's three spans are extremely rare examples of true skew a... More