Replacement bus service running on Arriva Trains Wales between Pontypridd and Aberdare, and between Pontypridd and Merthyr Tydfil due to over running engineering works between Pontypridd and Abercynon South.
The first trains in each direction have been cancelled. Buses are replacing these trains. Arriva Trains Wales hope that a normal service will resume from around 14:00.
We've had a great response from people across Wales sending in pictures of the snow.
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A teenager accused of murdering a man in Aberdare has appeared before magistrates in Merthyr.
Corey Liam Thomas, 18, has been charged with the murder of 45-year-old Andrew Male.
The parents of Andrew David Male, whose body was found at a house Cardiff Road on Wednesday, have described him as a "very caring and considerate person".
"We are saddened and shocked by what has happened to our Andrew", adding he was someone "we will all dearly miss".
South Wales Police have confirmed an 18 year-old man has been charged with the murder of 45-year-old Andrew David Male.
The man is due to appear at Merthyr Magistrates Court on Friday morning.
Police have launched a murder investigation after the body of a man was found in Aberdare in the early hours of this morning. An 18-year-old man has been arrested. From the scene, here's our Correspondent Joanna Simpson.
A man who died at his home in Aberdare in the early hours of this morning has been named as Andrew David Male. He was 45.
South Wales Police have launched a murder investigation. An 18-year-old man arrested after the incident is being held at Cardiff Bay Police Station.
People will be shocked about what has occurred in their usually quiet community, but I am appealing for some perspective as this type of incident is extremely rare. We have a team of specially trained investigators assigned to this case, and local officers are carrying out house to house enquiries, providing reassurance to local people. We have somebody in custody and are doing everything we possibly can at this stage.
Police in Aberdare have launched a murder investigation after the death of a 45-year-old man. Officers were called to a house on Cardiff Road at 3am this morning.
An 18-year-old local man has been arrested in connection with the incident.
South Wales Police is asking anyone who was in the area between 2am and 3.20am this morning, and who may have seen or heard anything suspicious, to contact them.
Cardiff Road is closed in both directions because of a police incident between Lewis Street and Chapel Street.