Baltimore and Potomac Railroad
|Dates of operation||1872–1902|
|Successor||Philadelphia, Baltimore & Washington Railroad|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
The Baltimore and Potomac Railroad (B&P) operated from Baltimore, Maryland, southwest to Washington, D.C., from 1872 to 1902. Controlled by the Pennsylvania Railroad, it was the second railroad company to connect the nation's capital to the Northeastern States, and competed with the Baltimore & Ohio Railroad. Part of the B&P route is now part of Amtrak's Northeast Corridor and the Maryland Transit Administration's MARC passenger commuter line.
Competition with the B&O
The leading advocate for expanding the railroad system into southern Maryland was Walter Bowie, who wrote articles under the pen name Patuxent Planter and who joined Thomas Fielder Bowie, William Duckett Bowie, and Oden Bowie (later Governor of Maryland), in lobbying the Maryland General Assembly to approve the idea. Their efforts bore fruit on May 6, 1853, when lawmakers chartered the Baltimore and Potomac Rail Road Company,:333–334 granting it the authority to construct a railroad from Baltimore via Upper Marlboro and Port Tobacco to a point on the Potomac River between Liverpool Point and the St. Mary's River. The charter also allowed the construction of branches of up to 20 miles (32 km) in length.
The B&P was organized on December 19, 1858, and began surveying the route on May 3, 1859. Construction started in 1861 but progressed slowly until 1867, when the B&P was purchased by the Pennsylvania Railroad (PRR) and its ally, the Northern Central Railway (NCRY). The PRR at the time had access to Baltimore via its own lines (the NCRY from the north and the Philadelphia, Baltimore & Washington Railroad from the northeast), and used the Baltimore & Ohio Railroad (B&O) and its Washington Branch to continue southwest to Washington. The PRR and B&O had trouble getting along, but Maryland refused to grant a charter to end the B&O's monopoly on Baltimore-Washington travel. However, the Baltimore and Potomac charter allowed exactly that, via the clause that allowed branches; all the PRR had to do was take the line within 20 miles (32 km) of Washington. Congress granted a charter for the section in Washington on February 5, 1867.:335
Thus the new Baltimore-Washington line opened on July 2, 1872, and the required "main line" to Popes Creek on the Potomac River, immediately relegated to branch status, opened on January 1, 1873. The final section, the Baltimore and Potomac Tunnel under Winchester Street and Wilson Street in Baltimore, opened on June 29, 1873, connecting the line to the PRR's Northern Central Railway (north to Harrisburg) and Baltimore's new Union Station. That year or the next, the Union Railroad also opened, extending the line eastward through another tunnel to the PRR's other Baltimore line, the Philadelphia, Wilmington & Baltimore Railroad (PW&B) northeast to Delaware and Pennsylvania.
Baltimore and Potomac Station in Washington
The first B&P station in Washington was a simple wood frame structure. A more substantial brick and stone building opened in 1873 at the southwest corner of Sixth Street and B Street NW (later renamed Constitution Avenue).:340 This is the present site of the West Building of the National Gallery of Art, on the National Mall. The station was built over the old Washington City Canal, which complicated the construction of the foundation.:340 Tracks ran south from the station along Sixth Street to a wye junction at Sixth Street SW, Maryland Avenue SW, and Virginia Avenue SW.
On November 1, 1902, B&P was consolidated with PW&B to form the Philadelphia, Wilmington & Baltimore Railroad (PB&W), also controlled by PRR.
New Washington Union Station alignment
The Washington Terminal Company and its Union Station opened in 1907, serving the PB&W, the B&O and several other railroads. All PB&W passenger trains from Baltimore were diverted to a new alignment called the Magruder Branch, splitting from the old one at Landover and running west to run parallel with the B&O Washington Branch on the approach to the new station.
Since then, the line has passed under control of Penn Central in 1968, followed by Conrail and Amtrak. Since the breakup of Conrail in 1999, Norfolk Southern has provided freight service over the main line. However, the Pope's Creek Subdivision (originally part of the chartered main line) is operated by CSX Transportation.
- Southern Maryland Line
The 48.7-mile (78.4 km) branch to Popes Creek was part of the original chartered main line, but from opening it was operated as a branch of the main line from the junction at Bowie. The main line from Bowie to Washington, a distance of 17.1 miles (27.5 km), was provided for in the charter as a branch.
There was a passenger and freight station at Collington on the Southern Maryland Line.  Today, a 5,200-foot railroad siding is all that remains of this stop, although the spur is still in use. It is located at milepost 3.0 on the spur. just south of where the spur crosses under Maryland Route 450 near Maryland Route 197.
- Maryland General Assembly. Chapter 194 of the 1853 Session Laws of Maryland, May 6, 1853
- Wilson, William Bender (1895). History of the Pennsylvania Railroad Company: With Plan of Organization. Philadelphia: Henry T. Coates & Company.
- "PRR Chronology: 1867" (PDF). PRR Research. Philadelphia Chapter, Pennsylvania Railroad Technical & Historical Society. June 2004. Retrieved 2010-05-09.
- Robert T. Netzlof (2002-06-12). "Corporate Genealogy Union Railroad". Retrieved 2007-10-01.
- Goode, James W. Capital Losses: A Cultural History of Washington's Destroyed Buildings. 2d ed. Washington, D.C.: Smithsonian Books, 2003. ISBN 1-58834-105-4.
- "PRR Chronology: 1907" (PDF). PRR Research. Philadelphia Chapter, Pennsylvania Railroad Technical & Historical Society. March 2005. Retrieved 2010-05-09.
- The Official railway guide: North American freight service edition. Philadelphia: National Railway Publication Co. 1889. p. 230.
- "Sacred Heart Church - The Parish with Colonial Roots - since 1728". Sacred Heart Church. Retrieved 2007-06-12.
- "CSXT - Popes Creek Subdivision". The Mainline. 2000. Archived from the original on 2007-07-07. Retrieved 2007-06-13.
- Hogan, Reverend John F. (1975). Sacred Heart Chapel 1741-1975: A Monograph on the Foundation and the Development of the old Sacred Heart Church - White Marsh.
- Corporate Genealogy - Philadelphia, Baltimore & Washington
- Hobo's Guide to the Pennsy - Main Line Washington to New York: Section 1
- Historic American Engineering Record (HAER) No. MD-163, "Baltimore & Potomac Interlocking Tower", 11 photos, 27 data pages, 2 photo caption pages
||Baltimore and Potomac Rail Road Company
chartered May 6, 1853
merged November 1, 1902
Philadelphia, Baltimore and Washington Railroad