| Junctions and other features | Running Lines | Stations, Signal Boxes and Junctions | Distance from Signal Box above | Loops and Refuge Sidings | Notes | ||
|---|---|---|---|---|---|---|---|
| Up | Down | ||||||
| 1 | – | ↓ | Nelson and Llancaiach | – | |||
| 2 | ↑ | ↕ | Ffaldcaiach Sidings | 0m 825yds | |||
| Trelewis Platform | |||||||
| Taff Merthyr Colliery Halt | |||||||
| 3 | ↕ | ↓ | Bedlinog | 3m 198yds | |||
| 4 | ↑ | ↓ | Bedlinog Colliery Junction | 0m 501yds | |||
| 5 | ↑ | ↓ | Cwmbarfoed | 3m 242yds | |||
| ↑ | ↓ | Penydarren Platform | |||||
| 6 | ↑ | ↓ | Dowlais Junction | 1m 1177yds | |||
| 7 | ↑ | – | Dowlais Caeharris | 0m 1098yds | |||