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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] (3414 visits) D Route pocket track on the Washington Metro system, showing the interlockings and the signal. This ...")
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Federal Signal Model 5 siren on the Hanover Street Bridge
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Rockville Bridge [01]
![Rockville Bridge [01]](../../../../../i/upload/2025/03/06/20250306062127-56106013-cu_s9999x250.jpg "Rockville Bridge [01] (829 visits) The Rockville Bridge, a rail bridge north of Harrisburg, Pennsylvania that carries Norfolk Southern ...")
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Rockville Bridge [03]
![Rockville Bridge [03]](../../../../../i/upload/2025/03/06/20250306062138-243039d4-cu_s9999x250.jpg "Rockville Bridge [03] (860 visits) The Rockville Bridge, a rail bridge north of Harrisburg, Pennsylvania that carries Norfolk Southern ...")