| Abbreviation | Definition |
|---|---|
| ERL | East Rail Line |
| ERM | En Route Metering |
| ERP | Electronic Road Pricing |
| ERS | Electronic Reservation Slip |
| ERS | Emergency Road Service |
| ERT | Extra Ride Time |
| ERTS | Enhanced Remote Transit Shed |
| ERV | Earth Return Vehicle |
| ERV | Explosive Resistant Vehicle |
| ES | Emergency Stop |
| ESA | Electronic Shift Assist |
| ESAL | Equivalent Single-Axle Load |
| ESARTS | En Route Stand- Alone Radar Training System |
| ESC | Electronic Spark Control |
| ESC | Electronic Speed Control |
| ESC | Electronic Stability Control |
| ESMMC | Enhanced SMMC |
| ESP | Electronic Stability Program |
| ESP | En Route Spacing Program |
| ESP | Encapsulating Security Payload |