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Great research - I love this kind of stuff. Delaware does have several historic covered bridges that are open to bike/ped as well as cars . . .

Great article!
I'm not sure if you're trying to list all of the bike ped tunnels in the area, including the really short ones, but if you are, here's one in Rockville that you might not have. It goes under Maryland Avenue. It's a bit hard to see in the satellite photo, but you can see it in the street view. I don't know how long it is, but as you can see, it's not very long - just the width of the street.

"neither DC nor Delaware have any bike/ped tunnels (yet)"

Don't know if they were converted from rail use, but the tunnel from the Cap Crescent under the C&O and canal rd

Also, a small ped-only tunnel going under 395/695 https://www.google.com/maps/@38.8828088,-77.0135074,3a,75y,163.24h,62.15t/data=!3m6!1e1!3m4!1s4zeBqvmpDIG4Wn503YrKqw!2e0!7i13312!8i6656

Is the Air Rights tunnel still open? I haven't been up there since the announced closing of "stuff" for the Purple Line. I don't know exactly where the shut down starts.

Of course, the Foundry Branch tunnel. It was not a rail tunnel, but still I should count it. will update. As for the other tunnel, I had no idea....

I think the Air Rights tunnel is closed.

I think the Foundry Branch Tunnel was water tunnel at one point. At least that is what I was told

Right, the branch used to run through the tunnel. And it was also used as a sewer. It was not a road for accessing the Foxall Foundry, as is so often reported.

During WWII there were some buildings erected between the Georgetown Branch and the river just downstream of Foundry Branch, with a short sideling. And the tunnel was used to access these buildings via automobile. But by the late 50's the buildings and sideling were gone.

I thought the Pentagon tunnel was pedestrians only.

I biked through it once.

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