next to the railway, and drove into the footbridge, knocking its superstructure onto the track. The DMU hit the footbridge debris approximately one minute later. Three people including the driver were taken to hospital. On 22 January 2010, unit 158701 was derailed at due to faulty points. One person sustained minor injuries. On 21 July 2013, unit 158774 was parked empty at when it was run into by 156402. Eight passengers were injured. The cause was driver error. On 1 April 2017, unit 158758 collided with the buffer stops at at a speed of . Fifteen people were injured. The cause was driver error. On 31 October 2021, a South Western Railway Class 159 unit, 159102, collided with Great Western Railway class 158 units, 158762 and 158763, at Salisbury tunnel junction, immediately before Fisherton tunnel. A preliminary RAIB report found the cause was poor adhesion conditions which led to the SWR train over-running a signal set at danger. Overseas sales State Railway of Thailand During 1990–1991, BREL built six three-car units based on the Class 158 for the State Railway of Thailand. Fleet details Notes References Further reading 158 158