| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
| 1 | - | ↓↓ | Abercynon | - | |||
| Pontcynon Halt | |||||||
| 2 | ↑↑ | ↓ | Pontcynon Junction | 0m 1656yds | |||
| Mathewston Halt | |||||||
| 3 | ↑ | ↓ | Penrhiwceiber Lower | 1m 66yds | |||
| Penrhiwceiber Low Level | |||||||
| 4 | ↑ | ↓ | Penrhiwceiber Upper | 0m 1205yds | URS 43 | ||
| 5 | ↑ | ↓ | Nixon's Crossing | 0m 1694yds | |||
| 6 | ↑ | ↓ | Mountain Ash, Oxford Street | 0m 462yds | |||
| Abercwboi Halt | |||||||
| 7 | ↑ | ↓ | Abercwmboi | 1m 159yds | |||
| 8 | ↑↑ | ↓ | Cwmbach Junction | 0m 1364yds | |||
| 9 | ↑ | ↓ | Aberaman | 0m 1029yds | c. 16.03.1964 | ||
| 10 | ↑ | ↓↓ | Aberdare South | 0m 1650yds | |||
| Aberdare, Low Level | |||||||
| 11 | ↑↑ | - | Aberdare North | 0m 374yds | |||