Here are two vintage signal rules and instructions books from Union Pacific RR CO, dating back to 1954 and 1972. These books are a great addition to any railroadiana or transportation memorabilia collection, and provide a fascinating look into the history of railroad signaling. The books were manufactured in the United States and are an excellent example of railroad history. The books contain detailed instructions and rules for operating and maintaining the railroad's signaling system, as well as useful information about the technical specifications of the equipment. They are a must-have for anyone interested in the history of railroads or transportation in general. Bid now to add these unique and valuable collectibles to your collection! Comes from a smoke-free, pet-free location.