After a bit of looking around I found some old maps which indicate that the bridge carried the north end of Sumner Street before I-75 cut it off.
The railroad crossed was the Lake Shore & Michigan Southern Railway (l. S. & M. S. Ry), a line which became a large part of the New York Central System. The bridge crosses the tracks at the west end of the Union Depot yard.
Ok I'm a PITA but someone has to point out things that don't make sense.
Conrail went out of business as a railroad over 12 years ago, so how is this a bridge "over Conrail RR"? If you check, I think you'll find it is Norfolk Southern. It would be more interesting to find out the owner of the line when the bridge was built.
Also I don't think that a highway bridge passing over a railroad qualifies as a "Railroad" Bridge.
On Google Maps it has it marked as "Rails to trails bridge Toledo union station."