Thank you for viewing. This is a railway destination sign. The blue one appears to be enamel, and there are some scratches on the mounting part (see photo 5). The white one seems to be made of iron, and there is considerable rust (see photos 3 and 4). It is unknown which line it was used on or around what time. It was hidden away in the back of a closet. I hope it catches the eye of someone who thinks, "Wow! What a treasure!!"