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This is 150yr old stone culvert under the train tracks. Apparently my friend's grandfather used to go down here with his dad (friend's great grandfather) when he was a kid and he'd crawl through for fun. Heh, olde New England.
If you follow it downstream through the woods it cuts a surprisingly deep canyon (about 10' at most) on its way down to the river. As kids we'd hang around around in there in summer when it was dried-up and concealed by overgrowth, as we got older we started having Test Of Manhood competitions by climbing down into it in the middle of winter and seeing who could sit in the icy rapids the longest without going into a coma or being swept down into the river :3