Between 11:33 and 14:08 on 27 January 2025, at least eight trains did not observe blanket speed restrictions of 50 mph (80 km/h) that had been imposed at two locations along the South Wales Main Line. The speed restrictions were in place because of forecast high winds between Neath and Swansea, and an associated hazard from high-risk trees between Bishton and Newport.

Although some of these trains travelled at speeds significantly above the imposed restrictions, there were no reported consequences.

We have undertaken a preliminary examination into the circumstances surrounding this incident. Having assessed the evidence which has been gathered to date, we have decided to publish a safety digest.

The safety digest will be made available on our website in the next few weeks.