OM-Old Main Line Sub

• CSX Old Main Line Subdivision operates on 160.2300 mhz
• Controlled by the BC Dispatcher on 160.3200 mhz
• Located between Baltimore,MD and Point of Rocks,MD (59.2 miles)
• Single Track Subdivision
• There are 3 Defect Detectors
• Coordinates are exact location

• Begin of CSX Old Main Line Sub/End of CSX Baltimore Terminal Sub
• Halethorpe (MD) - Milepost BAA5.8/BAC5.8
• St. Denis (MD) Passenger Sta. - Milepost BAC6.8
• East Avalon (MD) - Milepost BAC7.9
• 9,621 Foot Siding - Milepost BAC8.5
• West Avalon (MD) - Milepost BAC9.8
• Ilchester Tunnel - Milepost BAC10.5 (1,404 Feet in length)
• Patapsco River Thru Truss Bridge - Milepost BAC10.69
• Ilchester,MD Defect Detector - Milepost BAC10.7 (WPYP898) (39.250876/-76.764461)
• Ellicott City,MD - Milepost BAC12.8
• Union Dam Tunnel - Milepost BAC15.2 (810 Feet in length)
• Daniels (MD) - Milepost BAC17.8
• Daniels Defect Detector - Milepost BAC18.1 (WNRF560) (39.316653/-76.816255)
• Dorsey Tunnel - Milepost BAC19.1 (1,022 Feet in length)
• Davis Tunnel - Milepost BAC19.9 (497 Feet in length)
• East Davis (MD) - Milepost BAC20.0
• 9,200 Foot Siding
• West Davis (MD) - Milepost BAC21.9
• Marriottsville (Rd.) (MD) - Milepost BAC24.35
• Henryton,MD Tunnel - Milepost BAC25.1 (430 Feet in length)
• Gorsuch (MD) - Milepost BAC26.2
• Sykesville,MD - Milepost BAC28.76
• Sykesville Tunnel - Milepost BAC29.6 (240 Feet in length)
• East Hood (MD) - Milepost BAC31.5
• 8,253 Foot Siding - Milepost BAC32.0
• West Hood (MD) - Milepost BAC33.1
• Woodbine,MD Tunnel - Milepost BAC33.6 (385 Feet in length)
• Watersville (Rd.) (MD) - Milepost BAC36.6
• Ridgeville (MD) Defect Detector - Milepost BAC38.9 (WNMM219) (39.361227/-77.144850)
• Mt. Airy,MD Tunnel - Milepost BAC40.3 (2,758 Feet in length)
• East Plane (MD) - Milepost BAC41.1 (Connection w/CSX Mt. Airy Industrial Track)
• 10,750 Foot Siding
• West Plane (MD) - Milepost BAC43.2
• Monrovia,MD - Milepost BAC46.1
• Ijamsville,MD - Milepost BAC49.3
• Hartman Tunnel - Milepost BAC50.8 (215 Feet in length)
• East Reel (MD) - Milepost BAC51.4
• 11,950 Foot Siding
• West Reel (MD) - Milepost BAC53.8
• Monocacy River Thru Truss Bridge - Milepost BAC53.9
• Frederick Junction (MD) - Milepost BAC54.2 (Connection w/MARC Frederick Branch)
• Lime Kiln,MD - Milepost BAC56.4
• Buckeystown,MD - Milepost BAC58.41
• Connection w/Eastalco Siding - Milepost BAC59.0
• Adamstown,MD - Milepost BAC60.44
• Doubs (Rd.) (MD) - Milepost BAC61.33
• Satterwhite (MD) - Milepost BAC64.3
• Point of Rocks,MD - Milepost BAC64.7/BA42.8
• End of CSX Old Main Line Sub/Begin of CSX Metropolitan Sub

• Maryland Area Regional Commuter (MARC) Frederick Branch operates on 160.2300 mhz
• Controlled by the CSX BC Dispatcher on 160.3200 mhz
• Located in Frederick,MD (3.4 miles)
• Single Track Branch
• There are no Defect Detectors

• Begin of MARC Frederick Branch/End of CSX Old Main Line Sub
• Frederick Junction (MD) - Milepost BAC54.2/BAX0.0
• Apex of Wye - Milepost BAX0.15
• Monocacy Passenger Sta. - Milepost BAX0.8
• 1,828 Foot Monocacy Siding - Milepost BAX1.0
• Monocacy (MD) - Milepost BAX1.1
• West Yard - Milepost BAX2.1
• East Yard - Milepost BAX2.2
• S. Wisner St. - Milepost BAX3.19
• Frederick,MD Passenger Sta. - Milepost BAX3.3
• END OF TRACK - Milepost BAX3.4

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