| Abbreviation | Definition |
|---|---|
| LT | Lake Terminal Railroad Company |
| LTC | Lafferty Transportation |
| LTCO | Lakeside Transportation L.L.C. |
| LTCR | Leelanau Transit |
| LTCR | Leelanau Transit Company |
| LTCX | Praxair Incorporated |
| LTCX | Union Carbide Corporation (Praxair) |
| LTEX | L. H. A. G. S., Incorporated - Larry's Truck Electric Service |
| LTEX | Larry's Truck and Electric Service |
| LTIU | Lloyd Triestine Di Navigazione |
| LTIU | Lloyd Triestine Di Navigazione, SP. A. |
| LTLZ | Burlington Northern and Santa Fe Railway Company |
| LTLZ | Lang Trailer Leasing (BNSF Railway) |
| LTMR | London Transport Miniature Railway |
| LTTX | Trailer Train (TTX Corporation) |
| LTTX | TTX Company |
| LTVX | LTV Steel |
| LTVX | LTV Steel Company |
| LUBX | Luria Bros. Division of Connell Limited Partnership |
| LUBX | Socony-Vacuum Oil Co. Lubrite Division (Philip Metals) |