A route marked on a map to Gypsum. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3296327/free-photo-image-passport-map-colorado-rugFree Image from public domain licenseSan Bernardino, California. A symbol on a freight car of the Saint Louis and San Francisco Railway (Frisco Lines). Sourced… https://www.rawpixel.com/image/12292298/photo-image-alphabet-public-domain-linesFree Image from public domain license