| Abbreviation | Definition |
|---|---|
| RLDA | Rail Land Development Authority |
| RLE | Rail Logistics Europe |
| RLEX | Relco Locomotives |
| RLGN | Mackenzie Northern Railway |
| RLGN | RaiLink Canada Limited - RaiLink Mackenzie Northern |
| RLGX | Rail Logix |
| RLHH | RaiLink Canada Limited - RaiLink Southern Ontario |
| RLHH | Southern Ontario Railway (Genesee & Wyoming) |
| RLIX | Rail Link |
| RLIX | Rail Link Incorporated |
| RLK | Rail Link |
| RLK | RaiLink Canada Limited - RaiLink Ottawa Valley |
| RLKX | R. L. and S. S. Klein |
| RLMX | David J. Joseph Company |
| RLMX | Joseph Transportation |
| RLR | Ruislip Lido Railway |
| RLRT | Regional Light Rail Transit |
| RLS | Rail Lock Slide |
| RLS | Rail Lock System |
| RLSX | Robert L. Shipp |