| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
|
Maximum permissible speed 85 m.p.h. for locomotive hauled passenger trains Maximum permissible speed 75 m.p.h. for multiple unit trains Maximum permissible speed 60 m.p.h. for freight trains |
|||||||
| 1 | - | ↓ | Tunnel Junction | - | |||
| 2 | ↑ | - | Southampton Junction | 0m 278yds | |||
| 1 | - | ↓ | Northam Junction | - | |||
| 2 | ↑ | ↓↓ | Southampton Junction | 0m 415yds | |||
| 3 | ↑↑ | ↓↓ | Chapel Crossing | 0m 407yds | |||
| 4 | ↑↑ | - | Southampton Yard | 0m 380yds | |||