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Winchester and Potomac Railroad Bridge [04]
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Winchester and Potomac Railroad Bridge [03]
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Winchester and Potomac Railroad Bridge [02]
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Winchester and Potomac Railroad Bridge [01]
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Wilkes Street Tunnel [15]
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Wilkes Street Tunnel [14]
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Wilkes Street Tunnel [13]
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Wilkes Street Tunnel [12]
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Wilkes Street Tunnel [11]
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Wilkes Street Tunnel [10]
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Wilkes Street Tunnel [09]
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Wilkes Street Tunnel [08]
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Wilkes Street Tunnel [07]
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Wilkes Street Tunnel [06]
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Wilkes Street Tunnel [05]
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Wilkes Street Tunnel [04]
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Wilkes Street Tunnel [03]
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Wilkes Street Tunnel [02]
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Wilkes Street Tunnel [01]
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Wheaton station, inbound side [03]
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Wheaton station, inbound side [02]
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Wheaton station, inbound side [01]
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Western portal of Blue Mountain Tunnel
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Washington Metro chain marker
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Vintage wall signage at the Chrysler Building
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Tuscarora Mountain Tunnel western portal
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Tunnel portal outside Addison Road station
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Tunnel portal north of West Hyattsville station
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Tunnel graffiti between City Hall and Brooklyn Bridge stations
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Tunnel beneath railroad tracks
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Train stored in the tail track at Huntington [02]
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Train stored in the tail track at Huntington [01]
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Train at 15th Street station
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Smoky conditions along I-95 [03]
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Smoky conditions along I-95 [02]
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Signal FT8 at 15th Street station
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Sign for Newark Airport and the Holland Tunnel
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Sign for Exit 268
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Selfie at Kittatinny Mountain
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Red Line tunnel between Metro Center and Gallery Place
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Reconstruction of Connecticut Avenue under Dupont Circle
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Railroad tracks at Harpers Ferry Amtrak station [05]
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Railroad tracks at Harpers Ferry Amtrak station [04]
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Railroad tracks at Harpers Ferry Amtrak station [03]
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Railroad tracks at Harpers Ferry Amtrak station [02]
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Railroad tracks at Harpers Ferry Amtrak station [01]
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Pennsylvania Route 641 at the turnpike
Pedestrian walkway on CSX Cumberland Subdivision bridge
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Pedestrian tunnel under Queen City Drive
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OC Transpo railcar 1106
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Montgomery Village tunnel #11
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Monitor-Merrimac Memorial Bridge-Tunnel [12]
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Monitor-Merrimac Memorial Bridge-Tunnel [11]
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Monitor-Merrimac Memorial Bridge-Tunnel [10]
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Monitor-Merrimac Memorial Bridge-Tunnel [09]
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Monitor-Merrimac Memorial Bridge-Tunnel [08]
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Monitor-Merrimac Memorial Bridge-Tunnel [07]
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Monitor-Merrimac Memorial Bridge-Tunnel [06]
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Monitor-Merrimac Memorial Bridge-Tunnel [05]
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Monitor-Merrimac Memorial Bridge-Tunnel [04]
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Monitor-Merrimac Memorial Bridge-Tunnel [03]
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Monitor-Merrimac Memorial Bridge-Tunnel [02]
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Monitor-Merrimac Memorial Bridge-Tunnel [01]
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Monitor-Merrimac Memorial Bridge-Tunnel
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Metro tunnel under South Hayes Street
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Marker graffiti in Harpers Ferry train station tunnel [02]
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Marker graffiti in Harpers Ferry train station tunnel [01]
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Kittatinny Mountain Tunnel [15]
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Kittatinny Mountain Tunnel [14]
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Kittatinny Mountain Tunnel [13]
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Kittatinny Mountain Tunnel [12]
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Kittatinny Mountain Tunnel [11]
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Kittatinny Mountain Tunnel [10]
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Kittatinny Mountain Tunnel [09]
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Kittatinny Mountain Tunnel [08]
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Kittatinny Mountain Tunnel [07]
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Kittatinny Mountain Tunnel [06]
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Kittatinny Mountain Tunnel [05]
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Kittatinny Mountain Tunnel [04]
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Kittatinny Mountain Tunnel [03]