| 1 | ROCK | Chicago, Rock Island and Pacific Ry. Co. | added 7/1975; 1/1980; eliminated 7/1980 | | NAKINA |
| 2 | ROCK | Chicago, Rock Island and Pacific Ry. Co. | added 7/75; 1/80; eliminated 7/80 | | NRHS |
| 3 | ROCK | CHICAGO, ROCK ISLAND & PACIFIC RAILROAD (ROCK ISLAND) | | | PWRC |
| 4 | ROCK | Chicago, Rock Island and Pacific Railroad | | | RSRV |
| 5 | ROCK | Chicago, Rock Island and Pacific Ry. Co | 1975 - 1980 | USA | TRAFFIC |
| 6 | ROCKLAND | Rockland Coaches | A Coach USA company | USA | TRAFFIC |
