Large Chicago and Northwestern Railroad - Minnesota Black Hills Express - Framed Photograph Large framed Chicago and Northwestern Railroad passenger train photograph. Features trains No. 515 on August 29, 1949 at Mankato, Minnesota. This information is attached to a brass plaque on the frame. Also mentioned is that the train is the Minnesota 8 Black Hills Express. Photograph features Chicago and Northwestern 4-4-2 steam locomotive No. 158. Photograph has some waving of the photograph paper as well as some light cracking of the photograph which extends through the right third of the photograph. The frame measures 39 1/4" x 25 1/4"