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Tuscarora Mountain Tunnel western portal
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Kittatinny Mountain Tunnel [02]
![Kittatinny Mountain Tunnel [02]](../../../../i/upload/2024/07/15/20240715141344-fd6f497d-cu_s9999x250.jpg "Kittatinny Mountain Tunnel [02] (3401 visits) Western portal of the Kittatinny Mountain Tunnel, one of four tunnels on the Pennsylvania Turnpike m...")
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Kittatinny Mountain Tunnel [01]
![Kittatinny Mountain Tunnel [01]](../../../../i/upload/2024/07/15/20240715141346-ee46943a-cu_s9999x250.jpg "Kittatinny Mountain Tunnel [01] (3277 visits) Western portal of the Kittatinny Mountain Tunnel, one of four tunnels on the Pennsylvania Turnpike m...")
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Western portal of Blue Mountain Tunnel
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Partially completed bridge pier
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Tracks descending into a tunnel
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East Falls Church interlocking
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Short section of track in cages
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Largo interlocking
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Vienna interlocking
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Tunnel portal outside Addison Road station
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Metro D Route pocket track [02]
![Metro D Route pocket track [02]](../../../../i/upload/2024/07/15/20240715141423-2fe25243-cu_s9999x250.jpg "Metro D Route pocket track [02] (2792 visits) D Route pocket track on the Washington Metro system, showing the interlockings and the signal. This ...")