Tracks under I-95 on north bank of the Susquehanna River

Driving down to Harford County, MD this past Friday night, I happened to look down at the north bank of the Susquehanna as I crossed it on 95 on the Millard Tidings Bridge. I noticed a RoW with illuminated PRR-style position light signals to the west of the bridge. What line is this and who does it belong to? How many trains a day use it?

That line is an old electrified line (PRR) from Harrisburg, running along the north bank of the Susquehanna River, connecting to the Northeast Corridor.

I forget the technical name of the line under PRR ownership.

"SemperFidelis"
That line is an old electrified line (PRR) from Harrisburg, running along the north bank of the Susquehanna River, connecting to the Northeast Corridor.

I forget the technical name of the line under PRR ownership.

Columbia and Port Deposit, commonly identified as the "Port Road".

Actually, that Norfolk Southern runs around on Port Roads..

Port Road NS Branch