| Posted by Kevin on October 30, 2021 | |
That device is fascinating. Is it on rails? It looks like there's a switch in front of the tunnel portal and that device may be on a siding.
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Nice and interesting find!
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I am thinking it was the form when they poured a new concrete liner. See the concrete streaks?
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is this contraption sitting on rails? I have seen it before and now do not remember the story behind it.
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The device is a Tunnel Lining Gantry/Trolley. You can actually see the rods at the ends of the horizontal framing that extend the sides out to hold the form in place while concrete is injected and then retract to move the form to the next location.
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