Some rail services will be replaced by buses for nine months due to work on the South Wales Metro.
Evening services to Merthyr Tydfil, Treherbert in Rhondda Valleys and Aberdare in the Cynon Valley will be replaced between 8pm and 5am on Sundays through to Thursdays.
The changes start on August 3 and run until May next year.
Early morning train services will not be affected and will run as usual.
In addition to this change on the weekend of August 1 and 2 there are changes to services on those three lines.
On Saturday, August 1, bus services will replace train services all day between Aberdare and Radyr stations.
On Sunday, August 2, bus services will replace morning train services across the whole of the Valleys network extending all day for Aberdare – Cardiff services.
Find out more about the railway improvements across the central south Wales valleys, including the recent £2m funding for work around RCT, here.
Transport for Wales said the work on upgrading the network in the area will take around three years to complete. Work began on a £100million metro depot in Taff's Well in January.
Timetables are constantly being updated as Transport For Wales' service adapts to the coronavirus so check your travel times, here.
