The Southern Railway gave its depots a code usually consisting of three letters based on the depot name, though a couple of depots had two-character codes.
| Code | Depot name |
|---|---|
| AFD | Ashford (Kent) |
| BPL | Barnstaple |
| BAS | Basingstoke |
| BM | Bournemouth |
| BA | Bricklayers Arms |
| BTN | Brighton |
| DOR | Dorchester |
| DOV | Dover |
| EBN | Eastbourne |
| ELH | Eastleigh |
| EXJ | Exmouth Junction |
| FAV | Faversham |
| FEL | Feltham |
| FRA | Fratton |
| GIL | Gillingham (Kent) |
| GFD | Guildford |
| HIT | Hither Green |
| HOR | Horsham |
| NPT | Newport (Isle Of Wight) |
| 9E | Nine Elms |
| NOR | Norwood |
| PLY | Plymouth |
| RAM | Ramsgate |
| RDG | Reading |
| RED | Redhill |
| RYD | Ryde (Isle Of Wight) |
| SAL | Salisbury |
| SOT | Southampton |
| STL | St Leonards |
| BAT | Stewarts Lane |
| 3B | Three Bridges |
| TON | Tonbridge |
| TWW | Tunbridge Wells |
| WAD | Wadebridge |
| YEO | Yeovil |