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OM-Old Main Line Sub

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  • 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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