| Term | Definition |
| CCU | Central Control Unit |
| DCS | Depot Control System |
| DPPS | Depot Personnel Protection System |
| EMC | Electromagnetic Compatibility |
| EU | European Union |
| IP | Ingress Protection |
| LOPS | Locally Operated Point System |
| NR | Network Rail |
| PCB | Plastic Circuit Board |
| REB | Relocatable Equipment Building |
| RSP | Route Setting Panel |
| SIL | Safety Integrity Level |
| TD | Train Describer |
| UPS | Uninterruptible Power Supply |
| Vac | Voltage, alternating current |
| Vdc | Voltage, direct current |
Forward House
High Street
Henley in Arden
B95 5AA
T: 03300 580180
T: 01926 358428
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