Thermopolis, "Home of the World's Largest Mineral Hot Springs," was founded in 1897 following the signing of a treaty with the Shoshone and Arapaho Indians. As part of the treaty, the mineral springs were made available to the public without charge. They still are today. 

This 1920's photo of Thermopolis is looking south over the town, towards the Wind River canyon. In the distance you can see the Big Horn river (upstream of its exit from the canyon, it's called the Wind river). On the far left, about center between top and bottom of the photo you can see the CB&Q. 

More info later. 

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Model RR Thermopolis