The prosecution told Birmingham Crown Court Network Rail would not spend money on an automatic locking device.

BBC: Jane Harding

Ted Scott, the American Trucking Association's director of engineering, said an automatic locking device secures the pin into the fifth wheel.

NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7

Mr Mott told the court although it may be a case of "human error", Maund's former employer Network Rail was equally culpable for Mrs Harding's death because it had not fitted an automatic-locking device at the Moreton-on-Lugg crossing as part of improvement works there.

BBC: Hereford & Worcester