The disruption is set to affect trains between Cardiff Central and Gloucester. Services may be cancelled in both directions between Cardiff Central and Gloucester, and disruption is expected until 10.30am. A spokesperson for Transport for Wales said: "Due to urgent repairs to the track at Caldicot, services may be delayed by up to 60 minutes. "Services may be cancelled in both directions between Cardiff Central and Gloucester. "We expect the incident to last until 08:30am and disruption to services is expected until 10:30am.