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Rail passengers are being warned to expect some reduced services on the Cardiff and valleys network this weekend.

Network Rail is carrying out improvement work on the routes between Cardiff and Rhymney, and Cardiff and Radyr to replace old equipment.

Some arrivals and departures will be changed from the normal Arriva Trains Wales (ATW) timetable.

Road services will replace trains on some routes.

The train company said overall capacity would be reduced because some services may be made up of fewer carriages than normal.

ATW customer services director Lynne Milligan added: "The changes that will take place have been carefully planned to minimise the impact on our busiest services.

"However, we are advising all passengers to allow extra time for their journey and would like to thank people for their patience whilst these improvement works take place."

Extra staff would be at Cardiff Central and other stations to help customers, she added.

Trains also may not leave from their normal platforms at Cardiff Central so passengers are being advised to listen for announcements or check with station staff.