Old Main Line Subdivision

Stations, Signals, and Track Diagram
WEST	Milepost	Name	Function	Notes
Baltimore Terminal sub	BAC6.5	Relay	subd	END Baltimore Terminal subdivision BEGIN Old Main Line subdivision note 1
7.0	BAC7.0	Relay	DD	defect detector, Relay Junction where the original B&O stopped, passengers relayed to horseback
	BAC7.9	E Avalon	EEDT	East Avalon passing siding
	BAC9.8	W Avalon	WEDT	west end Avalon passing siding
	BAC10.5	Ilchester tunnel	tunnel	Ellicott City
Patapsco River	BAC10.6	Patapsco River	trestle	through-truss bridge over Patapsco River
Wilkins Rogers	BAC12.0	Wilkins-Rogers	industry	Wilkins-Rogers flour, corn mill lies across trestle on north side of river
Ellicott City	BAC12.8	Ellicott City	station	nation's oldest surviving passenger station now a B&O Railroad museum, terminus of original 13 miles
	BAC15.2	Union Dam tunnel	tunnel	U.S. 40 passes over the curved tunnel; Union Mill dam removed in 2010
	BAC16.61	Old Frederick Rd	grade xing	Old Frederick Road, not Hollifield Road (that's across the bridge); “old Route 99”
Patapsco River	BAC18.0	Patapsco River	trestle	bridge over Patapsco River; Eddy's Welding
18.1	BAC18.1	Daniels	DD	defect detector
	BAC19.1	Dorsey tunnel	tunnel	Dorsey tunnel
	BAC19.9	Davis tunnel	tunnel	Davis tunnel
	BAC20.0	E Davis	EEDT	east end double track
	BAC21.9	W Davis	WEDT	west end double track
	BAC25.1	Henryton tunnel	tunnel	Henryton tunnel
Sykesville	BAC28.7 BAC28.76	Sykesville Main St	station grade xing	former B&O passenger station now Baldwin's Station Restaurant & Pub on Main Street/Old Sykesville Road
m-o-w	BAC29.4	Sykesville i.t.	spur	Sykesville industrial track, maintenance-in-the-way storage; stub ends in front of Baldwin's Station
	BAC29.6	Sykesville tunnel	tunnel	Sykesville tunnel, a real shawty
	BAC30.08	Gaither Rd	grade xing	Gaither Road crossing
	BAC31.33 BAC31.51	Hoods Mill Rd SR97	grade xing	Hoods Mill crossing Old Washington Road/Georgia Avenue Extended
	BAC31.5	E Hood	EEDT	east end double track
	BAC33.1	W Hood	WEDT	west end double track
	BAC33.22	Morgan Rd	grade xing	Morgan Station Road crossing
	BAC33.6	Woodbine tunnel	tunnel	Woodbine tunnel
	BAC34.21	Woodbine Rd	grade xing	Where the Woodbine twineth
Woodbine	BAC34.3	Woodbine storage	spur	short storage track
	BAC38.4	Twin Arch Rd	trestle	Twin Arch Road runs under B&O arched concrete viaduct, 1 for the road, 1 for the stream
38.9	BAC38.9	Twin Arch	DD	defect detector, Ridgeville / Mount Airy
	BAC40.3	Mt. Airy tunnel	tunnel	Mount Airy tunnel
Mt Airy ind. trk	BAC41.1	E Plane	EEDT spur	east end double track, Mount Airy industrial track remnant of original line uphill into town; tanks for Willard fertilizer
	BAC43.2	W Plane	WEDT	west end double track; Bartholows Road overhead highway just east of switch
	BAC50.8	Hartman tunnel	tunnel	Hartman tunnel
	BAC51.4	E Reel	EEDT	east end double track
	BAC52.74	Reel's Mill Rd	grade xing	after which it is named, in the middle of double track
	BAC53.8	W Reel	WEDT	west end double track
Monocacy River	BAC54.2	Monocacy River	trestle	bridge over the Monocacy River
Frederick branch	BAC54.2	Frederick Jct	wye radio	junction Frederick branch, used mainly for commuter service; only west leg controlled; dispatcher base station
	BAC55.40	Marcie's Choice Ln	grade xing	very secretive gummint facilities, including wastewater treatment plant; no rail service here
ProBuild Bimbo	BAC55.6 BAC55.8	ProBuild Bimbo Bakeries	industry industry	ProBuild lumber products of Thomas' English Muffin fame; watch the local man drill in & out of Bimbo
	BAC56.04	English Muffin Way	grade xing
Toys R Us	BAC56.1	Blue Linx	industry	Toys R Us, Blue Linx building products
CCRL	BAC56.2	AMRL	industry	AASHTO Materials Reference Laboratory, Cement and Concrete Reference Laboratory
Tamko	BAC56.43 BAC56.5	Buckeystown Pk	grade xing industry	Buckeystown Pike Tamko Building Products, asphalt, shingles
	BAC56.72	Lime Kiln Rd	grade xing	Line Kiln Road crossing, do not block while doing extra switchin'
	BAC57.2	Essroc	industry	north switch; multiple industry tracks for Essroc, Vulcan, Frederick Asphalt, N.A.
Essroc	BAC57.9 BAC58.41	Essroc Manor Woods Rd	industry grade xing	south switch into Essroc lead
LVI	BAC59.01 BAC59.1	New Design Rd Manor Woods LVI	grade xing signal industry	Nudesign Road Loyer intermediate signal LVI Demolition Services
	BAC60.44	Mountville Rd	grade xing	Adamstown, MD; CSX calls it Montville Road, but what do they know???
	BAC61.33	Doubs Rd	grade xing	Doub acquired nearby 1812 flour mill from Charles Carroll, signer of Declaration of Independence
	BAC62.0	Doubs	EEDT	double track the rest of the way to Point o' Rocks
substation	BAC62.8	Doubs substation	spur	Doubs power substation, P.J.M. or PEPCo
Track 3 Track 4				tracks #3 and 4
	BAC64.3	Satterwhite SR28	x-over jct grade xing	crossover 3 to 4, junction Metropolitan sub east leg to track #1 eastbound; Route 28
Metropolitan sub	BAC64.7 BA68.4	Point of Rocks	subd	END Old Main Line sub BEGIN Metropolitan sub

Frederick Jct. to Frederick Station
EAST	Milepost	Name	Function	Notes
To Baltimore To Brunswick	BAC54.2 BAX0.15	Frederick Jct apex	wye	Jct Old Main section
	BAX0.7	closed	industry	construction supply business, out of business as of July, 2012
Monocacy	BAX0.8	Monocacy	WEDT station	Monocacy siding and MARC commuter station
	BAX1.1	Monocacy siding	EEDT	east end siding
	BAX2.1	West Yard	WEDT	west end MARC storage track
MARC yard	BAX2.2	East Yard	EEDT	MARC commuter train storage yard
	BAX2.5	Monocacy Bl	grade xing	Monocacy Boulevard, just north of I-70 overpass
	BAX2.88	South St	grade xing	South Street, Frederick, MD
Willard	BAX3.1	Willard	industry	Willard Agri-Services, the last remaining industry on the Frederick branch
	BAX3.18 BAX3.2	Wisner St	grade xing signal	westbound absolute signal, eastbound permissive
Frederick	BAX3.3	Frederick station	station	Frederick MARC commuter station
END OF TRACK	BAX3.4	END OF TRACK	END OF TRACK	END OF TRACK, Frederick spur

Notes

Note 1: The Baltimore and Ohio Railroad is recognized as the first common carrier railroad and the first to offer scheduled freight and passenger service to the public in the United States. The Old Main Line was its first route laid west from Relay, Maryland (to the southeast of Baltimore proper) along the banks of the Patapsco River. Today it sees limited use because of its grades and curves, typically with empty trains returning east to Baltimore, while most traffic traverses the Capitol and Metropolitan subdivisions.

Track chart compiled from publicly available information (such as signs posted at grade crossings) and released under Creative Commons license: distribution permitted with proper attribution. This private site is not affiliated with CSX Transportation. Trademarks and artwork are presented under Fair Use provisions for historical reference and informational purposes only. Nothing herein is offered for sale or trade.

RAILFAN GUIDE

Baltimore Division