| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
| 1 | – | ↓ | Severn Tunnel East | – | |||
| 2 | ↑ | ↓ | Severn Tunnel West | 4m 1595yds | |||
| 3 | ↑↑↑ | – | Severn Tunnel Junction East | 0m 1100yds | |||