| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
| 1 |
 |
- | ↓ | Woolaston (Map) | - | ||
| 2 | ↑ | ↓ | Beachley Junction | 3m 1276yds | DGL 71 | ||
| 3 |
 |
↑ | ↓ | Wye Valley Junction | 0m 1370yds | ||
| 4 | ↑ | ↓ | Tutshill Halt (Map) | ||||
| 4 | ↑ | ↓ | Chepstow (Map) | 0m 1412yds | URS 96 | ||
| 5 | Portskewett (Map) | 4m 352yds | DRS 60 UGL 76 |
||||
| 6 |
? |
Caldicot Junction | 1m 110yds | DGL 60 URS 65 |
|||
| Caldicot Halt (Map) | |||||||
| 7 | ↑ | ↓↓↓↓ | Severn Tunnel Junction East | 1m 814yds | UGL 71 | ||
| Severn Tunnel Junction (Map) | |||||||
| 8 | ↑↑ | ↓↓↓↓ | Severn Tunnel Jn Middle | 0m 682yds | |||
| 9 | ↑↑↑ | ↓↓ | Severn Tunnel Junction West | 0m 654yds | |||
| Undy Halt (Map) | |||||||
| 10 | ↑↑↑ | ↓↓ | Magnor (Map) | 1m 1463yds | |||
| 11 | ↑↑ | ↓↓ | Bishton | 1m 1578yds | |||
| 12 | ↑↑ | ↓↓ | Llanwern Station (Map) | 1m 1512yds | |||
| 13 | ↑↑ | ↓↓ | Lliswerry Crossing | 1m 753yds | |||
| 14 | ↑↑ | ↓↓ | East Usk Junction | 0m 1320yds | |||
| 15 | ↑↑ | ↓↓ | Nettlefolds Branch Junction | 0m 902yds | |||
| 16 | ↑↑↑ | ↓↓ | Maindee Junction East | 0m 484yds | |||
| 17 | ↑ | ↓↓↓ | Newport East | 0m 990yds | |||
| Newport (Map) | |||||||
| 18 | ↕↑↑ | ↓↓ | Newport West | 0m 643yds | |||
| 19 | ↑↑ | ↓↓ | Gaer Junction | 0m 1171yds | |||
| 20 | ↑↑ | ↓↓↓ | Alexandra Dock Junction | 0m 583yds | |||
| 21 | ↑↑↑ | ↓↓ | Ebbw Junction | 0m 665yds | |||
| 22 | ↑↑ | ↓↓ | St. Brides | 1m 1556yds | |||
| 23 |
 |
↑↑ | - | Marshfield (Map) | 1m 1320yds | ||