List of Abbreviations and Acronyms| AAR | American Association of Railroads |
| ACC | Ancillary Card Cage |
| ACSES | Advanced Civil Speed Enforcement System |
| AMQP | Advanced Message Queue Protocol |
| ATC | Automatic Train Control |
| BCP | Base Communications Package |
| BNSF | Burlington Northern Santa Fe |
| BOS | Back Office Servers |
| CCTV | Closed Circuit TV |
| CDU | Computer Display Unit |
| CSX | CSX Transportation |
| DTS | Dark Territory Server |
| EMP | Edge Message Protocol |
| ETMS | Electronic Train Management System |
| EULA | End-User License Agreement |
| FRA | Federal Railroad Administration |
| GE ACC | General Electric Ancillary card Cage |
| GETS | GE Transportation Services |
| HLCS | HyRail Limits Compliance System |
| I-ETMS | Interoperable Electronic Train Management System |
| IoT | Internet of Things |
| ISMP | InterSwitch Message Protocol |
| ITC | Interoperable Train Control Committee |
| ITCM | Interoperable Train Control Messaging |
| ITCSM | Interoperable Train Control Systems Management |
| LMC | LILEE Mobility Controller |
| LMS | LILEE Mobility Server |
| M2M | Machine to Machine |
| MCP | Mobile Communications package |
| MOW | Maintenance of Way |
| MPLS | Multiprotocol Label Switching |
| NEC | Northeast Corridor |
| NS | Norfolk Southern |
| NTSB | National Transport Safety Board |
| OBN | On Board Network |
| PTC | Positive Train Control |
| PTC3 | Positive Train Control Communications Commander |
| RME | Remote Command Execution |
| RSIA | Railway Safety Improvement Act |
| SDR | Software Defined Radio |
| SNMP | Simple Network Management protocol |
| SMA | System Management Agent |
| SMG | Systems Management Gateway |
| SSH | Secure Shell |
| TMC | Train Management Computer |
| UP | Union Pacific |
| UPRR | Union Pacific Railroad |
| WIU | Wayside Interface Unit |
| WMS | Wayside Messaging Server |
| WSRS | Wayside Status Relay Service |
| XSS | Cross Site Scripti¹ng |
| ZCC | Zero Client Configurations |