Well David, your first picture is the #4 locomotive of the said railroad and it’s narrow gauge. The second picture is the “S” curve trestle owned by the parent company of the Coeur d’Alene Railway & Navigational Company which was the Northern Pacific Railroad. The “S” curve trestle lasted into the 1960’s when it was finally removed and the old switch back re-opened. As far as your last picture, that’s something that takes place in Montana and come from Elk.
Chuck