| Abbreviation | Definition |
|---|---|
| DLD | Detroit Lincoln Denver |
| DLFX | Diversified Lease Funding |
| DLFX | Diversified Lease Funding Incorporated |
| DLGX | Lewis Grain |
| DLKU | Deltank |
| DLKU | Deltank Limited |
| DLMX | Daylight Locomotives and Machine Works |
| DLMX | Daylight Locomotives and Machine Works Incorporated |
| DLNW | Denver, Laramie and North Western Railroad (Great Western Railway of Colorado) |
| DLPX | DeGussa Canada |
| DLR | Docklands Light Railway |
| DLRR | DisneyLand RailRoad |
| DLRX | GE Railcar Services Corporation |
| DLRX | General Electric Railcar Services Corporation |
| DLSX | Diesel Supply |
| DLSX | Diesel Supply Company Incorporated |
| DLTX | Dale L. Thornborough |
| DLVX | Thiokol Corporation |
| DLW | Consolidated Rail Corporation |
| DLW | Delaware, Lackawanna and Western Railroad (Norfolk Southern) |