| Abbreviation | Definition |
|---|---|
| LAPX | Linde Air Products (GATX) |
| LARU | Lanan |
| LARU | Lanan Incorporated |
| LASB | Lackawaxen and Stourbridge Railroad |
| LATU | Transatlantic Lines |
| LAX | Los Angeles Station (LA Metrorail - Metrolink - AMTK) |
| LBFX | L.B. Foster |
| LBR | Lowville and Beaver River Railroad |
| LBSCR | London, Brighton South Coast Railway |
| LBSCR | London, Brighton & South Coast Railway |
| LBTU | Lubrication Technologies,Inc |
| LBWX | Pulaski Development |
| LBWX | Technical Propellants Incorporated |
| LC | Lancaster and Chester Railway |
| LC | Lancaster and Chester Railway Company |
| LCCE | Lee County Central Electric |
| LCCX | Liquid Carbonic Corporation |
| LCEU | FMC Corp |
| LCEX | Lone Star Industries |
| LCEX | Lone Star Industries Incorporated |