| 1 | RMR | Romaero Ltd. | Callsign: Romaero, | RO | AVCODES |
| 2 | RMRA | RADIATEUR MONTREAL RADIATOR INC | | | SCAC4 |
| 3 | RMRB | RIEMER BROS INC | | | SCAC3 |
| 4 | RMRB | RAMIREZ BROS | | | SCAC4 |
| 5 | RMRD | RAM ROD TRUCKING & STORAGE INC | | | SCAC3 |
| 6 | RMRD | ROMERO, MARISCOS | | | SCAC4 |
| 7 | RMRF | REIMER FARM SUPPLIES LTD | | | SCAC3 |
| 8 | RMRG | RICHARDS, MARK RACING | | | SCAC4 |
| 9 | RMRI | R & M TRANSPORTS INC | | | SCAC3 |
| 10 | RMRI | R M EXPRESS INC | | | SCAC4 |
| 11 | RMRO | RAM ROD TRUCKING | | | SCAC3 |
| 12 | RMRP | RO-MAR TRANSPORTATION SYSTEMS, INC | | | SCAC3 |
| 13 | RMRP | RO-MAR TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 14 | RMRR | Rocky Mountain Railcar and R.R., Inc. | added 10/1987; eliminated 1/1991; added 10/1991; 1/1994; eliminated 1/1997; 7/2000-7/2005 | | NAKINA |
| 15 | RMRR | Rocky Mountain Railcar and R.R., Inc. | added 10/87; eliminated 1/91; added 10/91; 1/94; eliminated 1/97; 7/2000 | | NRHS |
| 16 | RMRR | ROCKY MOUNTAIN RAILCAR & RAILROAD, INC | | | PWRC |
| 17 | RMRR | Rocky Mountain Railcar and Railroad | | | RSRV |
| 18 | RMRR | ROCKY MOUNTAIN RAILCAR AND RAILROAD | | | SCAC3 |
| 19 | RMRS | RAMAPO ROADWAY SERVICES CO INC | | | SCAC3 |
| 20 | RMRT | RAMROD TRUCKING INC | | | SCAC3 |
| 21 | RMRW | ROCKY MOUNTAIN RECREATION TOURS (20 | | | SCAC4 |
| 22 | RMRX | Rocky Mountain Railtours | 7/2005 (not listed) | | NAKINA |
| 23 | RMRX | ROCKY MOUNTAIN RAILTOURS | | | PWRC |
| 24 | RMRX | Rocky Mountaineer | | | RSRV |
| 25 | RMRX | Rocky Mountaineer Railtours | | USA | TRAFFIC |
