Time Lapse on the Continental Divide
In this case the time lapse is 5 years, which is the difference between when these two photos were taken. The one on the top is from the top of Paywell Mtn. It was taken a few weeks ago, and it's looking north toward the western portal of the Alpine Tunnel.
The lower photo is looking south at Paywell Mtn. taken in 2005 from above the Alpine Tunnel, which sits squarely on the Continental Divide. You can see the turntable where the locomotives were turned around in the lower right. If you look really close, you can see Durango Doug standing right next to the turntable. I can't tell if he has his shirt on.