Railway line in Maryland
| Old Main Line Subdivision |
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 Eastbound coal train on the Old Main Line Subdivision at Monrovia in 2011 |
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| Status | operational |
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| Locale | Maryland, USA |
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| System | CSX Transportation |
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| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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in 1917
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0.0
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Relay
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2.5
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Orange Grove
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3.2
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3.5
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Ilchester Bridge
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3.6
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Ilchester
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4.4
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Lees
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4.7
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Gray
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5.7
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Ellicott City
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6.2
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Sucker Branch Bridge
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7.9
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Union Dam Tunnel
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9.2
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HS Tower
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9.5
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Hollofield
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10.6
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Daniels Bridge
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10.9
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Alberton
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11.6
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Brice Run Bridge
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12.1
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Dorsey’s Run Tunnel
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12.7
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Eureka Bridge
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12.8
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Line Run Bridge
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12.9
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Davis Tunnel
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13.3
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Davis
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13.8
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Davis Branch Bridge
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14.6
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Woodstock
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17.1
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Marriottsville
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17.7
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Henryton Bridge
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17.8
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17.9
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Henryton
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19.7
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Gorsuch
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21.6
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Sykesville Station
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22.4
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Sykesville Tunnel
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22.9
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24.2
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Hood’s Mill
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26.1
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Morgan
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26.5
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Woodbine Tunnel
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26.8
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Woodbine
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26.9
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Gillis Falls Bridge
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29.5
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Watersville
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30.6
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Watersville Junction
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31.8
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Mount Airy
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32.6
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Mount Airy Tunnel
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33.9
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Mount Airy Junction
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37.4
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Bush Creek Bridge
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39.5
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Monrovia
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40.0
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Monrovia Tower
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42.9
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Ijamsville
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44.1
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Hartman Tunnel
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46.1
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Reel’s Mill
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47.4
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47.5
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Frederick Junction
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43.5
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48.9
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50.0
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Lime Kiln
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51.7
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Buckeystown
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53.7
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Adamstown
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53.9
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Adamstown Junction
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Adamstown Cutoff
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58.0
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58.5
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Point of Rocks Tunnel
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60.1
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Catoctin Tunnel
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Ellicott City Station, built 1830, is the oldest surviving passenger station in the United States. Photo taken in 1970, looking south towards Baltimore.
The Old Main Line Subdivision is a railroad line owned and operated by CSX Transportation in the U.S. state of Maryland. The line runs from Relay (outside Baltimore) west to Point of Rocks, and was once the main line of the Baltimore and Ohio Railroad, one of the oldest rail lines in the United States. At its east end, it has junctions with the Capital Subdivision and the Baltimore Terminal Subdivision; its west end has a junction with the Metropolitan Subdivision.[1][2]
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