The Metropolitan Subdivision is a railroad line owned and operated by CSX Transportation in the District of Columbia and the U.S. state of Maryland. The line runs from Washington, D.C. northwest to Weverton, Maryland along a former Baltimore and Ohio Railroad (B&O) line.
At its southeast end, north of Union Station, the Metropolitan Subdivision meets the Capital Subdivision (formerly called the B&O Washington Branch) and Amtrak's Northeast Corridor. It meets the Old Main Line Subdivision at Point of Rocks, Maryland, and at its northwest end in Weverton, the line joins the Cumberland Subdivision.
The section northwest of Point of Rocks opened in 1834 as part of the B&O's main line. The rest of the line, from Point of Rocks southeast to Washington, opened in 1873 as the B&O's Metropolitan Branch.:7 Upon the opening of this line, the B&O rerouted its through passenger traffic through Washington, and the Old Main Line, from Point of Rocks to Relay, was reduced to secondary status as far as passenger service was concerned. Some through freight trains were also rerouted to use the new line.
Due to increasing congestion, the B&O began to add double track portions to the line in 1886. The Washington-to-Gaithersburg section was double-tracked by 1893.:277 During the peak years of passenger operation, 1893 to the 1920s, there were eighteen trains per day, with as many as 28 stops along the Met Branch.:7
Significant engineering features include bridges across:
- Tuscarora Creek. Originally a Bollman truss iron bridge, replaced with a girder bridge in 1904.
- Monocacy River. Originally a 700-foot-long (210 m) Bollman truss, replaced with a seven-span girder bridge in 1904.
- Little Monocacy River. Originally a 500-foot wood trestle, replaced by a 331-foot stone arch viaduct in 1906.
- Great Seneca Creek (Waring Viaduct). Originally a 400-foot-long (120 m) wood and iron trestle, replaced with an arch stone viaduct in 1906.
- Little Seneca Creek. Originally a timber bridge, replaced with a steel trestle in 1896, and then a concrete arch in 1928.
- Rock Creek. Originally 4 100-ft Bollman trusses, replaced by a stone arch bridge in 1896.
Double-tracking was completed on the remainder of the branch in 1928. Several distinctive passenger stations, designed by architect Ephraim Francis Baldwin, were constructed along the line. Original stations still stand at Rockville (moved away from the tracks in 1981), Kensington, Gaithersburg, Dickerson, and Point of Rocks.:6-10
In 1906 a rear collision at Terra Cotta station killed 53 people.
The Georgetown Branch ran from a junction north of the Silver Spring station station to the Georgetown area of Washington, D.C. The branch was built between 1892 and 1910. It was originally intended to be a B&O extension that would cross the Potomac River near the Chain Bridge. In 1904 the B&O reached agreement with the Pennsylvania Railroad to access the nearby Long Bridge over the Potomac, and then proceeded to use the Georgetown Branch as a spur servicing local industries in Silver Spring, Chevy Chase, Bethesda and Georgetown.:27-29 Significant engineering features on the branch include the Rock Creek Trestle in Chevy Chase, the Dalecarlia Tunnel and a through-truss bridge over the Chesapeake and Ohio Canal.
CSX abandoned the Georgetown Branch in 1986, and the spur is now accessible to the public as the Capital Crescent Trail.
Through mergers, the line became part of the CSX system in 1987. The entire subdivision is signaled for bi-directional running. There is a spur that services Mirant's Dickerson Generating Station (formerly owned by the Potomac Electric Power Company (PEPCO)) at Dickerson, and a trash-transfer facility spur at Derwood. The interlockings on the line are (east to west): F Tower, QN Tower, Georgetown Jct, Twinbrook, Derwood, Buck Lodge, PEPCO, East Rocks, Point of Rocks, East Brunswick, WB Tower and Weverton.[better source needed][dated info]
Interlocking plants were added in 2012 at Montrose (near Rockville), Dickerson, and at Tuscarora.
- CSX Transportation. "Northern Region, Baltimore Division, Timetable No. 4." Effective 2005-01-01.
- Harwood, Jr., Herbert H. (1979). Impossible Challenge: The Baltimore & Ohio Railroad in Maryland. Baltimore, MD: Barnard, Roberts. ISBN 0-934118-17-5.
- Soderberg, Susan C. (1998). The Met: A History of the Metropolitan Branch of the B&O Railroad, Its Stations and Towns. Germantown, MD: Germantown Historical Society.
- PDF (100 KiB), February 2004 Edition
- The Georgetown Branch - History and photos