| 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 50 m.p.h. | |||||||
| 1 |
 |
– | ↓ | Watford Junction No. 1 | – | ||
| 2 | ↑ | ↕ | Watford Junction No. 3 | 0m 465yds | |||
| 3 | ↕ | Watford North Halt (L.C.) | 0m 1302yds | ||||
| 4 | ↕ | Bricket Wood Station | 2m 840yds | ||||
| Park Street & Frogmore Station | |||||||
| 5 |
 — |
↕ | St. Albans Abbey Station | 2m 1703yds | |||