Ironic - these tunnels were large enough to allow N&W's huge steam locomotives to pass through them, but yet they were made even larger years later to allow the even larger stacked intermodal trains to pass through them. Nice photo.
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Cool tunnel. I have to assume that the fact that they're shaped like a mushroom, or a bishop in chess, is because they needed to raise the height of the tunnels to be able to accept trains like the one passing through.
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