| Abbreviation | Definition |
|---|---|
| RCJ | Railway Collector's Journal |
| RCL | Remote Controlled Locomotive |
| RCMX | Services Unlimited |
| RCOX | Arco Products |
| RCOX | Arco Products Company - Division of Atlantic Richfield Company |
| RCPO | Rail Corridor Protection Officer |
| RCPX | Railcar Limited |
| RCPX | Southern Illinois Railcar |
| RCR | Road cum Rail |
| RCRR | Red Coat Road and Rail |
| RCRR | Red Coat Road and Rail Limited |
| RCRX | Reagent Chemical and Research |
| RCRX | Reagent Chemical and Research Incorporated |
| RCRY | Raritan Central Railway |
| RCSX | Red-Corn Scrap Metals |
| RCSZ | Rail Container Services |
| RCSZ | Rail Container Services Incorporated |
| RCT | Railroad Commission of Texas |
| RCT | Riverdale, Calumet, & Thornton |
| RCTX | Railwest Canada |