Memory says one of the tunnels (the first one west of town) you couldn't walk through, there was a wall in it. Folks were using the east end as a horse barn.
I'm interested in the tunnels IN Manitou, to the left of Ruxton Avenue. There were two of them, both with the portals partially caved in. I did find a picture of the Iron Spring Trestle over both Ruxton Creek and Ruxton Avenue. This is the one I was wondering about.
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donsdepot.donrossgroup.net]
BTW, the CM station in Manitou still stands, it is a private residence.