| 1 | KRMX | Union Tank Car Co. | added 7/1961; 7/1965-4/1970; eliminated 7/1973 | | NAKINA |
| 2 | KRMX | Kerr-McGee Oil Industries, Inc. | added 7/1956; 10/1957-4/1961; eliminated 7/1961 | | NAKINA |
| 3 | KRMX | Kerr-McGee Oil Industries, Inc. | added 7/56; 10/57-4/61 | | NRHS |
| 4 | KRMX | Union Tank Car Co. | 7/65-4/70; eliminated 7/73 | | NRHS |
| 5 | KRMX | *KERR-MCGEE OIL INDUSTRIES, INC. (UNION TANK CAR CO.) | | | PWRC |
| 6 | KRMX | *KERSHAW MANUFACTURING COMPANY, INC. | | | PWRC |
| 7 | KRMX | KAWASA | | | SCAC4 |
