That's fantastic...reminds of a bike trail in Elroy-Sparta Wisconsin...the tracks were removed and paved bike path thru 3 tunnels...I will have to dig up my photos...thanks for sharing these...the temp usually drops 30 degrees inside these tunnels.These might be a repeat but I'll post them. Hoosac tunnel about five miles long, people like hike through it. The haze is smoke from a train that had passed through, I think I'll take the long way around. ( Eastern portal.)View attachment 220773 View attachment 220774 View attachment 220775