Pennsylvania Railroad, Brandywine Valley Viaduct, Spanning Brandywine Creek & U.S. Route 322, Downingtown, Chester County, PA
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 Philadelphia & Thorndale Branch, a low-grade freight line constructed as part of massive improvements during the early 20th century.
Unprocessed Field note material exists for this structure: N591
Survey number: HAER PA-518
Building/structure dates: 1903-1904 Initial Construction
Building/structure dates: 1948-1951 Subsequent Work