Perhaps you are referring to the Mining Tour package with the Durango-Silverton Train? The tour of the Old Hundred Gold Mine begins with a short electric mine train 1600 ft into the mountain. After touring the mine and the museum in Silverton, take the train from Silverton to Durango.
It is a great tour.
Thanks guys. You are right, train not running at this shoulder time of the season, but had a great time exploring the ghost town in the snow, and participating in the fantastic hospitality of this town.