And it isn't a train!
This tunnel is located on US Route 16A near Mount Rushmore. In fact, even though this photo wouldn't prove it, you can see Washington, Jefferson, Roosevelt and Lincoln out of that bright portal.
The highway is narrow, but not as narrow as the tunnel. Many people never make their way to this spot because tour buses are wider than the tunnel! Our little group of four had a private guide for the day, so we got to see it.
This is for the #joinindaily theme curated by +Johnny Wills, open to anybody who wants to add their photo related to the daily themes that he posts..