Emergency services are dealing with an ongoing incident involving two trains that collided at 'low speed' near Llanbrynmair.
British Transport Police said officers were called to the Cambrian railway line near the Powys village at 7.29pm on Monday, October 21
Paramedics, fire and rescue, and Dyfed-Powys Police are all in attendance and the incident is ongoing.
There have been no confirmed reports of any injuries.
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In a joint statement, Network Rail and Transport for Wales said: "Emergency services are responding to an incident near Llanbrynmair in Powys, Mid Wales, involving two trains - the 18.31 Transport for Wales service from Shrewsbury to Aberystwyth and the 19.09 Transport for Wales service from Machynlleth to Shrewsbury.
"The line is closed as they carry out their work. Our main priority is the safety of our passengers and colleagues, and we are doing all we can to support the emergency services as they respond to the incident."
The National Police Air Service for the West and Wales Region said a helicopter from St Athan responded to the train crash.
A post on the social media site X said: “The helicopter from St Athan, along with other helicopter agencies and emergency services, responded to the train crash in Llanbrynmair.
“Our thoughts are with everyone affected.
“Grateful for the coordinated efforts of all teams on the ground and in the air.”
First Minister Eluned Morgan, who is also a regional MS for Mid and West Wales, said she has asked to be kept informed of any developments throughout the night.
"My thoughts are with all those involved in the rail incident in Powys earlier this evening," she said. "I would like to thank the emergency services for their response."
Politicians in Westminster, including Transport Secretary Louise Haigh, Secretary of State for Wales Jo Stevens and Montgomeryshire and Glyndwr MP Steve Witherden, also shared their thanks to emergency services who have been working at the scene of the crash, before adding that their thoughts were with all those involved.
Wales Air Ambulance Service and the Mid and West Wales Fire and Rescue Service have been approached for an update.
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