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
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
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
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
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
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
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
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
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
Significance: South Station's interlocking system was a prototypical solution to the problem of handling the huge numbers of track and signal changes required at a large railroad terminal. The interlocking sys More
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
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
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
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
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
Significance: As of 1974, the President St. Station was one of the oldest large city railroad terminals still standing in the United States. The station quite possibly contains one of the earliest uses of the More
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
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
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
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