| 1 | UPR | Union Pacific R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 2 | UPR | Union Pacific R.R. Co. | 1/94-7/2000 | | NRHS |
| 3 | UPR | UNION PACIFIC RAILROAD COMPANY | | | PWRC |
| 4 | UPR | Union Pacific Railroad | | | RSRV |
| 5 | UPR | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
| 6 | UPRI | UNITED PLASTIC RECYCLING INC | | | SCAC4 |
| 7 | UPRQ | UNION PACIFIC RAILROAD COMPANY | | | PWRC |
| 8 | UPRQ | Union Pacific Railroad | | | RSRV |
| 9 | UPRR | UNION PACIFIC RAILROAD COMPANY | | | PWRC |
| 10 | UPRR | UNION PACIFIC RAILROADS | | | SCAC1 |
| 11 | UPRR | UNION PACIFIC RAILROAD | | | SCAC4 |
| 12 | UPRU | UNION PACIFIC RAILROAD COMPANY | | | PWRC |
| 13 | UPRU | Union Pacific Railroad | | | RSRV |
| 14 | UPRU | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
| 15 | UPRX | Ultra-Penn Refining Co. | 7/1932-7/1937 | | NAKINA |
| 16 | UPRX | Pennsylvania-Conley Tank Line, a Division of General American Transportation Corp. | 4/1938 | | NAKINA |
| 17 | UPRX | Union Pacific Fruit Express Co. | added 1/1978; 1/1980; eliminated 7/1984 | | NAKINA |
| 18 | UPRX | Ultra-Penn Refining Co. | Apr-38 | | NRHS |
| 19 | UPRX | Union Pacific Fruit Express Co. | added 1/78; 1/80; eliminated 7/84 | | NRHS |
| 20 | UPRX | *PENNSYLVANIA-CONLEY TANK LINE, DIV. GENERAL AMERICAN TRANSPORTATION CORP. [ULTRA-PENN REFINING CO.] | | | PWRC |
| 21 | UPRX | *UNION PACIFIC FRUIT EXPRESS CO. | | | PWRC |
| 22 | UPRX | Union Pacific Fruit Express | | | RSRV |