Table 32 – Sydney Trains services descriptor
| Descriptor | Meaning |
| S | Signal cable |
| C | Copper communications cable |
| OF | Optic fibre cable (for any Sydney Trains branch) |
| LV | Low voltage power – Voltages less than or equal to 1000 VAC or 1500 V DC |
| HV | High voltage – Voltages greater than 1000 V AC or 1500 V DC |
| EB | Electrolysis bond cable |
| CCTV | Closed circuit television |
| SD | Station data (Smartcard and miscellaneous data cabling) |
| DC | 1500 V direct current system cable |
| CUL | Culvert |
| TD | Drainage Pipe |
| CA | Compressed air |
| AR | Abandoned route |
| USM | Un-coded service mix |