LLANDUDNO Junction train station is to remain closed until Thursday.
The station was forced to close following an electrical fire on Saturday morning.
Engineers and building inspectors are still accessing the building's safety. The site has been closed to the public since Saturday.
Passengers travelling to Llandudno Junction from either the Crewe/Chester direction, or from the Holyhead/Bangor direction, will need to change at Colwyn Bay for a bus service.
An Arriva Trains Wales spokesperson said: "We are working closely with our partners in Network Rail and external engineers to minimise the disruption around Llandudno Junction and restore services to normal as quickly as possible.
"We would like to thank our customers for their patience."
A blaze broke out on Saturday morning.
A spokesperson from North Wales Fire and Rescue said: "We were called to Llandudno Junction station at 7.09am. We sent two crews.
"This was an electrical fire. Two firefighters attended with breathing apparatus.
"The fire was under control by 8.28am."
Passengers travelling from Llandudno Junction will need to travel by replacement bus service to Colwyn Bay, to join train services towards Chester,Cardiff, Manchester, London and towards Bangor and Holyhead.
Bus services will operate between Llandudno, Llandudno Junction and Colwyn Bay.
The train service is currently suspended between Llandudno Junction and Blaenau Ffestiniog. A replacement bus service is being operated by Llew Jones Coaches.
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