Baltimore & Ohio Southwestern Railroad

Reporting mark: B&OSW
Originally the Marietta & Cincinnati Railroad ( http://en.wikipedia.org/wiki/Marietta_and_Cincinnati_Railroa...), the railroad was renamed Baltimore & Ohio Southwestern Railroad in 1889. Merged into the Baltimore & Ohio in 1900.

Source: http://en.wikipedia.org/wiki/Baltimore_and_Ohio_Railroad

B&O - Big Darby Creek Bridge (Pickaway County, Ohio)
Deck truss span replaced 1941 by two plate girder spans relocated from elsewhere; rest of plate girder spans remain today
Lost Pratt deck truss bridge over Big Darby Creek on Baltimore and Ohio Railroad
Replaced by a new bridge

CSX - Tunnel Hill Road Overpass (Lawrence County, Indiana)
Stone arch bridge over Tunnel Hill Road on CSX Railroad
Open to traffic