The lives of the train crew that work on the Swansea to London train route.
| Actor | Role |
|---|---|
 Mali HarriesSophie Thomas | Sophie Thomas |
 Richard ElisDyfrig Williams | Dyfrig Williams |
 Siôn PritchardEllis 'Reality' Hughes | Ellis 'Reality' Hughes |
| FFfion WilliamsPandora Powell | Pandora Powell |
 Aled PughGwenci | Gwenci |
 Gillian ElisaEluned Hughes | Eluned Hughes |
 Caitlin RichardsAlex | Alex |
 Ruth JonesIngrid Crenski | Ingrid Crenski |
 Ieuan RhysSiôn Evans | Siôn Evans |