Train services between Lisvane & Thornhill (LVT) and Rhymney (RHY) are being disrupted due to a fault on a train.
Transport for Wales says services will be delayed by up to 10 minutes.
It says: “Services may be cancelled in both directions between Cardiff Central (CDF) and Rhymney (RHY).
“Disruption to services is expected until 10am.
“The problem has now been rectified and services are able to run.
“Delays and cancellations are expected until 10am.
“We’re sorry for the disruption to your journey today.”
