Union Pacific Cabooses
Builders
| AC&F | American Car and Foundry Company |
| Barney & Smith | Barney and Smith Manufacturing Company |
| Chicago | Chicago Falls Car Company |
| LA&SL | Los Angeles and Salt Lake Railroad |
| Mason | Mason and Company |
| Mich. Pen. | Michigan Peninsular Car Company |
| MC&F | Missouri Car and Foundry Company |
| Mt. Vernon | Mt. Vernon Car Manufacturing Company (Mt. Vernon, Illinois) |
| NCRR | North Coast Railroad |
| O&W | Oregon and Washington Railway |
| OR&N | Oregon Railway and Navigation Company (The Dalles, Oregon) |
| OWR&N | Oregon-Washington Railway and Navigation Company |
| PC&F | Pacific Car and Foundry Company (Seattle, Washington) |
| PSC | Pressed Steel Car Company |
| Pullman | Pullman Car Company (Chicago, Illinois) |
| St. Charles | St. Charles Car Company |
| Standard | Standard Steel Car Company |
| UPRR | Union Pacific Railroad Omaha Shops (Omaha, Nebraska) |
| USRS | United States Rolling Stock Company |
| Utah Central | Utah Central Railway (OSL subsidiary) |
| Western | Western Steel Car and Foundry Company |
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