Philadelphia Subdivision
Northbound CSX Transportation manifest train on the Philadelphia Subdivision in Newark, Delaware
Overview
Status	Operational
Owner	CSX Transportation
Locale	Pennsylvania, Delaware, and Maryland
Termini	Philadelphia, Pennsylvania Baltimore, Maryland
Service
Type	Freight rail
System	CSX Transportation
Operator(s)	CSX Transportation
Technical
Number of tracks	1-2
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Route map Legend MP Trenton Subdivision CR Delair Branch 0.0 CP Park Eakins Oval I-676 / US 30 SEPTA Regional Rail PA 3 JFK Blvd. PA 3 Market Street Chestnut Street Walnut Street South Street Harrisburg Subdivision I-76 3.3 Harrisburg Subdivision B&O Railroad Bridge over Schuylkill River Amtrak Northeast Corridor Wilmington/Newark Line Cobbs Creek Darby Creek SEPTA Route 11 US 13 SEPTA Route 102 PA 420 I-476 PA 320 PA 352 Chester Chester Creek US 322 PA 452 PA 491 Pennsylvania Delaware border DE 92 DE 3 I-95 DE 202 I-95 / US 202 Brandywine Creek DE 52 Wilmington Water Street DE 48 28.5 East Penn Railroad DE 2 East Penn Railroad East Penn Railroad DE 100 DE 141 30.7 Wilmington & Western RR DE 62 Red Clay Creek DE 7 White Clay Creek DE 2 / DE 72 DE 896 DE 273 Delaware Maryland border MD 277 MD 213 MD 545 I-95 MD 272 MD 222 Perryville 57.7 Port Road Branch CSX Susquehanna River Bridge over Susquehanna River MD 155 Havre de Grace MD 22 MD 132 Aberdeen MD 7 MD 543 MD 24 MD 152 MD 43 US 40 I-695 I-95 89.6 CSX Bay View Yard Sparrows Industrial Track 90.3 Baltimore Terminal Sub. This diagram: view talk edit

The Philadelphia Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. states of Pennsylvania, Delaware, and Maryland. The line runs from Philadelphia, Pennsylvania, southwest to Baltimore, Maryland, along a former Baltimore and Ohio Railroad (B&O) line.

At its north end, CP NICE, in Nicetown-Tioga, Philadelphia, the Philadelphia Subdivision becomes the Trenton Subdivision. The south end of the Philadelphia Subdivision is near Bay View Yard, where the Baltimore Terminal Subdivision begins.

The line was built by the Baltimore and Philadelphia Railroad in Pennsylvania and as a branch of the B&O Railroad in Delaware and Maryland. The line began full operation in 1886. North of Philadelphia, the B&O used the lines of the Philadelphia and Reading Railway to reach the New York City area. Passenger train service on the Philadelphia Subdivision was led by the Royal Blue, its flagship train. The B&O ceased operation of passenger trains on the subdivision in 1958, and since then the line has been used only for freight trains.

In the 1970s and 80s the line passed through leases and mergers to CSX.

As of July 2022, Aberdeen, Maryland is restoring the former B&O Aberdeen station, the last remaining station on the line.

• List of CSX Transportation lines

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