| Abbreviation | Definition |
|---|---|
| SCXF | South Central Florida Express |
| SCXU | Alnery No. 954 Limited |
| SCXU | Alnery No. 954 Limited ( U. K.) |
| SCXU | Alnery Number 954 Limited |
| SCXY | St. Croix Valley Railroad |
| SCXY | St. Croix Valley Railroad Company |
| SCYX | Farmers Cooperative Association of York, Nebraska |
| SCYX | First Union Rail |
| SCYZ | Sea Containers |
| SCZU | Yorkshire Marine Containers |
| SCZU | Yorkshire Marine Containers (BNSF Railway) |
| SDA | San Diego and Arizona Railway |
| SDAE | San Diego and Arizona Eastern Railway |
| SDBB | Somerset Terminal Railroad |
| SDCU | Southern California Edison |
| SDCX | AMAX Chemical Corporation |
| SDCX | Consolidated Minerals Incorporated Feed Supplement Division |
| SDER | San Diego Electric Railway |
| SDEX | Swindell- Dressler Energy Supply Company |
| SDEX | Swindell-Dressler Energy Supply |