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| | Union Pacific EMD F Units |
 | | The Union Pacific Railroad was an early convert to the benefits of dieselization, and as such, was the owner of the largest fleet of EMD F3A cab units and F3B booster unit locomotives in the nation, with 89 cab units and 90 booster units. |
 | | The four cab units, six booster units, and two FP7s that came in 1952, along with the one F7A that came in 1953, were not ordered as such, but came either as special purchases or as replacements for other, wrecked locomotives. |
 | | The remaining three cab units, 904, 905, and 909, were rebuilt to F7As by EMD at La Grange in late 1954 and early 1955, becoming the 1455, 1456, and 1460. |
| utahrails.net /articles/up-f-units.php (5004 words) |
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