| 1 | CKP | Colorado, Kansas and Pacific Ry. Co. | 7/2000-7/2005 | | NAKINA |
| 2 | CKP | Colorado, Kansas and Pacific Ry. Co. | Jul-00 | | NRHS |
| 3 | CKP | COLORADO KANSAS & PACIFIC RAILWAY CO. | | | PWRC |
| 4 | CKP | Colorado Kansas and Pacific Railway | | | RSRV |
| 5 | CKPA | C K SERVICES INC | | | SCAC3 |
| 6 | CKPC | CLARK TRANSPORTATION CORP | | | SCAC3 |
| 7 | CKPD | CHICKS PRODUCE INC | | | SCAC3 |
| 8 | CKPH | COOK, PHIL TRUCKING | | | SCAC3 |
| 9 | CKPI | CLARKS PLANTFOOD INC | | | SCAC3 |
| 10 | CKPN | CLARK TRANSPORTATION | | | SCAC3 |
| 11 | CKPO | CLARK TRANSPORTATION | | | SCAC3 |
| 12 | CKPP | C & K PETROLEUM PRODUCTS INC | | | SCAC4 |
| 13 | CKPQ | CLARK TRANSPORTATION INC | | | SCAC3 |
| 14 | CKPQ | CLARK TRANSPORTATION INC | | | SCAC4 |
| 15 | CKPR | CENTRAL OKLAHOMA PRODUCE SERVICE | | | SCAC3 |
| 16 | CKPS | CAMTRAK TRANSPORTATION SERVICES LTD | | | SCAC3 |
| 17 | CKPT | CLARK TRANSPORTATION SERVICES INC | | | SCAC3 |
