| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
| 1 | - | ↓ | Stonefield Junction | - | |||
| 2 | ↑ | ↓↓ | Cardiff Queen St. North | 1m 601yds | |||
| 3 | ↑ | ↓ | Crwys Sidings | 0m 1413yds | |||
| 4 | ↑ | ↓ | Heath Junction | 1m 269yds | |||
| Heath Halt H.L. | |||||||
| Llanishen | |||||||
| 5 | ↑ | ↓ | Cherry Orchard | 2m 804yds | UGL 71 DGL 63 |
||
| Cefn On Halt | |||||||
| 6 | ↑ | ↓↓↓ | Wernddu | 1m 1369yds | |||
| 7 | ↑ | ↓↓ | Caerphilly East | 0m 1127yds | |||
| Caerphilly | |||||||
| 8 | ↑↑ | ↓ | Caerphilly West | 0m 627yds | |||
| Aber Junction Halt | |||||||
| 9 | ↑ | ↓↓ | Aber Junction | 0m 1122yds | |||
| 10 | ↑↑ | ↓↓ | Llanbradach | 1m 1229yds | |||
| 11 | ↑ | ↓↓ | Ystrad Mynach South | 2m 985yds | |||
| Ystrad Mynach | |||||||
| 12 | ↑ | ↓ | Ystrad Mynach North | 0m 1012yds | |||
| 13 | ↑ | ↓ | Hengoed L.L. | 0m 1716yds | DGL 60 | ||
| 14 | ↑ | ↓ | Pengam (Glam.) | 1m 484yds | |||
| 15 | ↑ | ↓ | Bargoed Pits | 0m 963yds | |||
| Gilfach Fargoed Halt | |||||||
| 16 | ↑ | ↓ | Bargoed South | 1m 143yds | URS 84 DRS 30 |
||
| Bargoed | |||||||
| 17 | ↑↑ | ↓ | Bargoed North | 0m 517yds | DRS 70 | ||
| 18 | ↑ | ↓ | Brithdir | 1m 110yds | DGL 55 | ||
| 19 | ↑ | ↓ | Tirphil | 1m 693yds | |||
| 20 | ↑ | ↕ | Pontlottyn | 2m 363yds | |||
| 21 | ↕ | Rhymney | 0m 1645yds | CL 22 | |||