According to the latest update from Network Rail, 8 passengers and 2 crew members were on board the train that derailed near Bargoed this morning.
There were 3 reported minor injuries, which were treated at the scene.
The emergency services and Network Rail are on site dealing with the incident.
Trains on the Rhymney Valley line are starting and terminating at Bargoed, with a bus service running between Bargoed and Rhymney.
More top news
The silver Mini was found in the River Teifi after a two-hour police search.
Six high rise blocks of flats have failed to meet fire safety standards, despite passing initial tests in the wake of the Grenfell tragedy.
The results are out of the latest Welsh Political Barometer for ITV Wales and Cardiff University, the only regular opinion polling in Wales.