| Term | Definition |
| EMC | Electromagnetic Compatibility |
| EU | European Union |
| GRIP | Governance for Railway Investment Projects |
| LED | Light Emitting Diode |
| LOPS | Locally Operated Point System |
| O&M | Operational and Maintenance |
| PPI | Points Position Indicator |
| PSP | Point Setting Panel |
| REB | Relocatable Equipment Building |
| RSP | Route Setting Panel |
| SIL | Safety Integrity Level |
| Vac | Volts, alternating current |
| Vdc | Volts, direct current |
Forward House
High Street
Henley in Arden
B95 5AA
T: 03300 580180
T: 01926 358428
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