Capital Subdivision

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The Thomas Viaduct, built in 1835 over the Patapsco River, was the largest bridge in the United States at that time. It still carries the Capital Subdivision today and is the world's oldest multiple arched stone railroad bridge.

The Capital Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of Maryland and the District of Columbia. The line runs from near Baltimore, Maryland southwest to Washington, D.C. along the former Baltimore and Ohio Rail Road (B&O) Washington Branch.[1] The subdivision's Alexandria Extension provides a connection to Virginia and points south.

Route description[edit]

Capital Subdivision
to Baltimore Terminal Subdivision
BAA
5.8
Halethorpe / HX Tower(closed)
to Old Main Line Subdivision
BAA
6.7
Amtrak Northeast Corridor
BAA
6.8
St. DenisOrange flag waving.svg MARC train.svg
BAA
9.0
Relay
originally Washington Junction
Thomas Viaduct over Patapsco River
I‑895
BAA
9.6
Elk Ridge
BAA
11.6
Hanover
BAA
13.4
Dorsey MARC train.svg
BAA
15.8
Jessup
originally Jessup Cut
MARC train.svg
Jessup Yard (East lead track)
Waterloo Industrial Track
Columbia Industrial Track
Jessup Yard
BAA
16.6
Annapolis Junction
(defunct)
Annapolis &
Elk Ridge RR
BAA
17.6
Fort Meade Junction
BAA
18.1
Savage MARC train.svg
to Westbound storage track
Corridor Industrial Track
Savage Industrial Track
BAA
20.9
Laurel Race TrackOrange flag waving.svg MARC train.svg
Patuxent River
BAA
21.3
Laurel MARC train.svg
BAA
24.9
Muirkirk
originally West Oak Bottom
MARC train.svg
BAA
25.8
Ammendale
BAA
26.9
Beltsville
I‑495 (Capital Beltway)
BAA
29.0
Greenbelt WMATA Metro Logo.svg MARC train.svg
BAA
30.0
Berwyn
BAA
31.4
College Park
originally Paint Branch
WMATA Metro Logo.svg MARC train.svg
BAA
32.4
Riverdale
BAA
32.7
Riverdale Park Junction
Alexandria
Extension
to RF&P Subdivision
BAA
33.6
JD Tower(demolished)
BAA
33.7
Hyattsville
originally Bladensburg
BAA
34.8
Brentwood
BAA
37.0
F Tower
to Metropolitan Subdivision
BAA
37.7
C Tower
K Tower(Amtrak)
BAA
38.7
Washington WMATA Metro Logo.svg MARC train.svg Amtrak
Orange flag waving.svg = flag stop

Main line[edit]

The northeast end of the line is at Halethorpe, Maryland, just north of the historic Thomas Viaduct, where it meets the Baltimore Terminal Subdivision and the Old Main Line Subdivision. Its southwest end is at the yard north of Union Station, at a junction with the Metropolitan Subdivision and Amtrak's Northeast Corridor.

Between Elkridge and Laurel, the Capital Subdivision's rail alignment forms the border between Howard and Anne Arundel counties, having been built before Howard County was created from western Anne Arundel County in 1844.

MARC Train's Camden Line provides passenger service over the entire length of the main line.

Alexandria Extension[edit]

The Alexandria Extension runs south 7.2 miles (11.6 km) from a junction at Hyattsville, Maryland to the Anacostia Railroad Bridge and the RF&P Subdivision in Southeast D.C. This busy route is used by freight trains to Virginia. It runs past Benning Yard and interchanges with the Landover Subdivision.

History[edit]

Main line[edit]

In 1831 the Maryland General Assembly authorized the B&O to build a branch from their main line within 8 miles (13 km) of Baltimore, to Washington.[2] As this line would take much business from the parallel turnpikes, especially the Washington and Baltimore Turnpike, the charter specifically allowed those companies to subscribe to the stock of the railroad. Construction began in July 1833, and the line opened on August 25, 1835, splitting from the B&O main line at Relay, roughly 7 miles (11 km) from Baltimore.[3]:157

Notable structural features on the original line include the Thomas Viaduct, the first multi-span masonry railroad bridge in the United States, and the largest bridge in the country when it was completed in 1835; and the earliest example of an iron truss bridge designed by Wendel Bollman and installed at Savage.[3]:361  [4]

Washington depots[edit]

The first B&O passenger station (1835–1852) was located west of the Capitol, at 2nd Street and Pennsylvania Avenue NW. In 1852 a new station was built at a point slightly north of the Capitol, on New Jersey Avenue NW, in the area now called Union Station Plaza. Trains reached that location via the current location of West Virginia Avenue, street-running trackage on I Street NE and Delaware Avenue, and private right-of-way just south of the current location of Louisiana Avenue. When the Washington Terminal Company opened the new Union Station in 1907, that alignment was changed to the current routing, partially using the former location of Delaware Avenue.

Alexandria Extension[edit]

Alexandria Extension
BAA
33.6
Capital Subdivision
WashingtonBaltimore
CFP
121.0
Apex of Wye
Northeast Branch Anacostia River
Baltimore-Washington Parkway
CFP
119.2
Jones Hill
US 50
Amtrak Northeast Corridor
Landover Subdivision
Washington Metro
Maryland
Washington, D.C.
border
CFP
117.2
Chesapeake Junction
CFP
116.0
Benning Yard
Landover Subdivision
CFP
115.4
Shepherd Junction
Shepherd Industrial Track
DC 295 (Anacostia Freeway)
CFP
114.8
Anacostia JunctionLandover Subdivision
Anacostia Railroad Bridge
over Anacostia River
CFP
113.8
M Street
RF&P Subdivision to Virginia

The Alexandria Extension, originally called the Alexandria Branch, was built in 1874 and ran 12.5 miles (20.1 km) to Shepherds Landing along the eastern shore of the Potomac River, to provide a connection to Virginia. The B&O had lost access to the Long Bridge across the river in 1870 due to political maneuvering by the Baltimore and Potomac Railroad (B&P)(controlled by the Pennsylvania Railroad (PRR)).[5] In order to efficiently route its trains to points south of Washington, the B&O set up a car float operation at Shepherds Landing, which carried freight cars across the river to Alexandria, Virginia. The ferry operation was discontinued in 1906 when the B&O obtained trackage rights from PRR. The B&O built a connecting track from the Alexandria Extension to the B&P's Anacostia Railroad Bridge, which provided access to PRR tracks in southwest D.C. (now called the CSX RF&P Subdivision) and the Long Bridge.

During World War II, the B&O re-activated the Shepherds Landing crossing at the request of the U.S. Army. The Army had requested an additional Potomac River crossing for troop movements to supplement those on the Long Bridge, and the Corps of Engineers built a temporary bridge across the river in 1942. Both B&O and PRR trains traveled over the 3,360 foot (1,020 m) bridge. Train operations on the bridge ceased in 1945 at the end of the war, and the bridge was demolished in 1947.[6]

For many years the junction at Hyattsville, called Alexandria Junction, was controlled by JD Tower. B&O built its first interlocking tower building at the site in 1894, and rebuilt the tower in 1912 and again in 1917. CSX closed this tower in 1992, and demolished it in 1994 after a fire.[7]

The original track from the junction at Anacostia Bridge to Shepherds Landing became known as the Shepherd Branch. This spur served several industries, including Bolling Air Force Base and the Blue Plains Advanced Wastewater Treatment Plant. (Shown as "Shepherd Industrial Track" on the diagram.) The Blue Plains plant was the only customer on the branch when rail service ended in 2001.[5]

Acquisition[edit]

The B&O became part of the Chesapeake and Ohio Railway in 1963 and the Chessie System in 1973. In 1980 Chessie became part of CSX, which now owns the line.

See also[edit]

References[edit]

  1. ^ CSX Timetables: Capitol (sic) Subdivision
  2. ^ Chapter 158 of the 1830 Session Laws of Maryland, February 22, 1831.
  3. ^ a b Dilts, James D. (1996). The Great Road: The Building of the Baltimore and Ohio, the Nation's First Railroad, 1828-1853. Palo Alto, CA: Stanford University Press. ISBN 978-0-8047-2629-0. 
  4. ^ Note: the present-day Bollman Truss Railroad Bridge, located on a railroad spur in Savage, was originally built for an unknown location on the Old Main Line, and relocated to Savage in 1877.
  5. ^ a b Schaller, Mike (2001). "The History of Baltimore & Ohio's Shepherd Branch". Classic Trains. 
  6. ^ National Railway Historical Society, Washington, D.C. Chapter. "Timeline of Washington, D.C. Railroad History." Accessed 2010-08-21.
  7. ^ JDTower.org. Accessed 2009-12-24.
  • Harwood, Jr., Herbert H. (1979). Impossible Challenge: The Baltimore & Ohio Railroad in Maryland. Baltimore, MD: Barnard, Roberts. ISBN 0-934118-17-5. 

External links[edit]