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| Book Title | Author |
| U | |
| Ultimate Train | Herring |
| Uncle Sam's Locomotives (The USRA and the Nation's Railroads) | Huddleston |
| Under Milwaukee Wires (Color Photography) | Marvel |
| Union Pacific Vol. 1 - 1862-1893 | Klein |
| Union Pacific Vol. 11- 1894-1969 | Klein |
| Union Pacific: Prototype Locomotive Photos, Vol 1 | Ehernberger |
| Union Pacific: Prototype Locomotive Photos, Vol 2 | Ehernberger |
| Union Pacific: Prototype Locomotive Photos, Vol 3 | Ehernberger |
| Union Pacific: Prototype Locomotive Photos, Vol 4 | Ehernberger |
| Union Pacific: Prototype Locomotive Photos, Vol 5 | Ehernberger |
| Union Pacific Across Sherman Hill | Drury |
| Union Pacific Color Guide to Fgt and Pass. Equipment, Vol. 1 | Stagner/Yanosey |
| Union Pacific Color Guide to Fgt and Pass. Equipment, Vol. 2 | Schmitz |
| (The) Union Pacific Diesel, Vol. I | Priest |
| Union Pacific in Southern California 1890-1990 | Duke |
| Union Pacific Power, Vol. 2, 1986-1996 | Winegar |
| Union Pacific Railroad: Vol. 1 Passenger Cars 1950-1964 | Davis |
| Union Pacific Railroad: Vol. 2 Passenger Cars 1940-1949 | Davis |
| Union Pacific RR History | Solomon |
| Union Pacific Steam: Big Boy Portraits | Bush |
| Union Pacific Steam in Color | Stagner |
| (The) Union Pacific Streamliners | Ranks & Kratville |
| Union Pacific's Challenger (An Unusual Pass. Train 35-71) | Dorin |
| Union Station, Kansas City | Spivak |
| Union Station, Washington DC | Highsmith |