An interim report from the Rail Accident Investigation Branch points towards a brake fault as the primary cause of the derailment at Llangennech, Wales, which caused a massive fire and environmental damage. The UK accident watchdog says that the oil tanker train was almost certainly derailed by a seized axle that destroyed a set of points and tore ten massive tankers off the rails. Consequently, lines have been blocked in South Wales since 26 August. There were no fatalities nor serious injuries, but the derailment is among the most destructive in British network history.