| Abbreviation | Definition |
|---|---|
| ERC | Eastside Rail Corridor |
| ERCU | Erco Industries |
| ERCU | Erco Industries Limited |
| ERCX | EXCEL Railcar Corporation |
| ERDX | Merchants Despatch Transportation Corporation |
| EREC | Enhanced Railway Emergency Calls |
| ERFU | Ermefer |
| ERFU | Ermefer S. A. |
| ERIA | Embedded Rail In Asfalt |
| ERIE | Consolidated Rail Corporation |
| ERIE | Erie Railroad (Norfolk Southern) |
| ERIX | ERIX Railcar |
| ERL | Express Rail Link |
| ERLX | Evans Railcar Leasing (GE Railcar Services Corporation) |
| ERLX | General Electric Railcar Services Corporation |
| ERSX | Excel Railcar Services |
| ERSX | Excel Railcar Services Incorporated |
| ERTMS | European Rail Traffic Management System |
| ES | Evolution Series locomotive |
| ESCX | Consumers Energy Company |