The train runs from Durango CO to Silverton CO and return. It's a fantastic ride behind vintage steam locomotives, just like the coal fired ones on the Cumbres and Toltec (see other portfolios). At one time the two railroads were connected and operated by the Denver and Rio Grande RR.
Here is a link to the website.
http://www.durangotrain.com/
Here is the Wiki link.
https://en.wikipedia.org/wiki/Durango_and_Silverton_Narrow_Gauge_Railroad