Train Mountain Railroad is the world's largest miniature hobbyist railroad near Chiloquin, Oregon, in Klamath County, which is in the south central region of Oregon. It is situated between Klamath Falls, Oregon, approximately 26 miles (42 km) to the south, and Crater Lake National Park to the north.Physical Location: 36941 South Chiloquin Road, Chiloquin, OR 97624, USA.