Network Rail says a landslip that caused a train to derail near Bargoed today arose as a result of flooding and snow thaw over the weekend.
This is the train which derailed near Bargoed this morning following a landslip.
Around 10 passengers were aboard the 6.10am Rhymney - Barry Island train when it hit debris resulting from fallen trees between Brithdir and Bargoed.
All passengers have now been safely removed from the train. There are no reported injuries.
Rhymney Valley train services will be terminating at Bargoed for the rest of the day. Replacement buses will operate between Bargoed and Rhymney.
A train which derailed near Bargoed just before 6.30am this morning struck debris from a landslip, Network Rail has confirmed.
Around 10 passengers were aboard the 6.10am Rhymney - Barry Island service when the incident occurred between Brithdir and Bargoed.
There are no reported injuries.
A train has been derailed by debris on the track near Bargoed following a landslip. Network Rail say around 10 people were on board at the time but nobody was injured. Buses are replacing trains between Bargoed and Rhymney.
The Welsh Secretary, David Jones, has expressed his pleasure at today's Network Rail announcement.
Mr Jones described a modern rail network in Wales as "crucial" for the growth of the country's economy.
He also welcomed news that the mainline between London and Cardiff will be electrified by 2018.