| Abbreviation | Definition |
|---|---|
| LUCX | LUCX Inc. (Railroad Car Management) |
| LUCX | Services Unlimited |
| LUN | Ludington and Northern Railway |
| LUNX | GE Rail Services Corporation |
| LUSX | LUSCAR Ltd |
| LUUX | Lux International Corporation |
| LUX | Tosco Corporation |
| LV | Consolidated Rail Corporation |
| LV | Lehigh Valley Railroad (Norfolk Southern) |
| LVAL | Lackawanna Valley Railroad |
| LVAL | Lackawanna Valley Railroad Corporation |
| LVRC | Lamoille Valley Railroad |
| LVRC | Lamoille Valley Railroad Company |
| LVRM | Lehigh Valley Rail Management |
| LVRR | Lycoming Valley Railroad |
| LVRR | Lycoming Valley Railroad Company |
| LVTC | Low Voltage Tunneling Current |
| LW | Louisville and Wadley Railway |
| LW | Louisville and Wadley Railway Company |
| LWAX | Laidlaw Environmental Services |