British Transport Police were called to the line near Llanbrynmair at 7.29pm on 21 October to reports of a low-speed train collision involving two trains.
There was a multi-agency emergency services response, including the Welsh Ambulance Service, Mid and West Wales Fire Service, Dyfed Powys Police, and the HM Coastguard, along with support from the rail industry.
Sadly, a man in his 60s has died following the collision.
The circumstances leading up to his death are under investigation.
His next of kin have been informed and his family are being supported by specialist officers. While formal identification has not taken place he is not believed to be a member of rail staff.
Thoughts remain with his loved ones and Police kindly ask they are given privacy at this time.
A further 15 people were taken to hospital with injuries not believed to be life threatening or life changing.
All other passengers were safely evacuated.
British Transport Police are working at pace, along with colleagues in emergency services and the rail industry, to understand the circumstances leading up to this collision and as a result there will be a continued emergency services presence in the area in the coming days.
