The Pembrokeshire railway line which was closed after a train derailment is expected to reopen today.
The derailment happened on Thursday evening, near Letterston in the Welsh Hook area. Twenty-nine passengers were taken to safety and no-one was injured.
Network Rail and Arriva Trains Wales released a statement on Friday saying they are investigating the circumstances which lead to the derailment.
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The announcement comes as part of efforts to tackle air pollution.