| 1 | UCX | United Coal Co. (Hillman Coal & Coke Co.) | 8/1920 | | NAKINA |
| 2 | UCX | United Coal Corp. (Cumberland & Pennsylvania R.R.) | 8/1920 | | NAKINA |
| 3 | UCX | Uvalde Construction Co. | 1/1941-4/1961 (not listed) | | NAKINA |
| 4 | UCX | Uvalde Construction Co. | 1/52-4/61 | | NRHS |
| 5 | UCX | CUMBERLAND & PENNSYLVANIA RAILROAD (UNITED COAL CORP.) [HILLMAN COAL & COKE CO.] | | | PWRC |
| 6 | UCXL | UNITED CROSSINGS TRANSPORTATION LLC | | | SCAC4 |
