"Pennsylvania Avenue Subway" Tunnel (Former Reading Railroad), Philadelphia, 2004.
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this post was submitted on 16 Feb 2025
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@[email protected] This section is an actual tunnel, with vent holes to the surface to accommodate the steam locomotives that ran through it. Other sections (not visible here except as a light in at the end in the far background) are cut-and-cover, then open trench, and then grade-level.
It was quite an project; there were several contemporary civil engineering journal articles written about it.