the Seaboard Air Line route between Petersburg-Norlina (blue) was abandoned and the Atlantic Coast Line route (yellow) became the main line, after the two railroads formed the Seaboard Coast Line
Source: US Geological Survey (USGS), Richmond, VA 1:1,250,000 topographic quadrangle (1973)
The Seaboard Air Line merged with the Atlantic Coast Line in 1967, forming the Seaboard Coast Line.
the northern portion of the Washington Southern Railway was the Alexandria and Fredericksburg Railway
Source: US Geological Survey (USGS), Mount Vernon, VA 1:125,000 topographic quadrangle
the Seaboard Coast Line and I-95 bridge during Hurricane Agnes flooding in 1972
Source: Library of Virginia, Aerial View of I-95
the Seaboard Coast Line inherited track of the Seaboard Air Line (blue) and Atlantic Coast Line (red)
Source: Wikipedia, Seaboard Coast Line Railroad