Google Earth shows bridge removed (not 45-deg view).
Is it possible that you are both correct? The Chessie System was a merger of the Chesapeake & Ohio with the Baltimore & Ohio, sometime in around 1970's, I think. Did the Ohio RR lease from B&O or the Chessie (C&O,B&O)? I don't know.
this wasnt over the "chessie" system. this was the B&O midland division now leased by the IORY.
While the girder isn't overly significant, I am absolutely disgusted to learn that this bridge's rare Phoenix columns have likely been scrapped.