The Penarth branch line will be disrupted by engineering works for the new South Wales Metro next month.
Transport for Wales (TfW) says there'll be no services on the line for eight days due to essential upgrade work at Cardiff Queen Street, running from 27th October to 3rd November.
The Coryton and Rhymney lines will also be affected.
Replacement bus services will be running, but TfW is urging all passengers to check before they travel.
According to the rail operator, the track and signalling work at Queen Street - a major junction for the Valley, City and Cardiff Bay lines - will be in preparation for more trains to run through the station. The ticket office will remain open during the closure.
There'll also be no trains running to Radyr from Merthyr, Aberdare or Treherbert between Saturday 28th September and Sunday 6th October.
TfW says over thirty pieces of engineering work will be carried out to allow them to run up to four trains an hour from the head of each valley. Replacement buses will be running - with all services to Cardiff Central starting and terminating at Radyr.
New timetables were introduced in June, affecting services to Barry Island and Penarth - with TFW diverting brand new electric trains from the Penarth line to other routes.
Last April, plans to introduce twice-hourly services on the Vale of Glamorgan Line between Bridgend and Cardiff were delayed until December 2025 at the earliest.
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