While the trackbed is in a cutting, it is extant for about 1 mile west of Coryton and could be extended to serve the new Velindre Hospital and/or a park and ride facility next to the Asda supermarket at M4 junction 32, with step/lift access. However, as
@Mister Ed stated in post 4356 above, there are no firm proposals to do so. Any extension would require a passing loop to be installed on the single track line, e.g. close to/at Rhiwbina halt, to enable at least a 30 minute frequency to be maintained, but previous plans to install a passing loop have been scrapped.