This website has been archived from TrainWeb.org/rslr to TrainWeb.US/rslr.
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| Reporting Marks |
Corporate Name And Location |
| UCIR | Union County Industrial Railroad Co. New Columbia, PA |
| URR | Union Railroad Company Monroeville, PA |
| UMP | Upper Merion & Plymouth Railroad Co. Conshohocken, PA |
| UCRY | Utah Central Railway Co. Ogden, UT |
| UTAH | Utah Railway Company Martin, UT |
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