The Staplehurst rail crash was a derailment at Staplehurst, Kent, on 9 June 1865 at 3:13 pm. The South Eastern Railway Folkestone to London boat train derailed while crossing a viaduct where a length of track had been removed during engineering works, killing ten passengers and injuring forty. In the Board of Trade report it was found that a man had been placed with a red flag 554 yards (507 m) away but the regulations required him to be 1,000 yards (910 m) away and the train had insufficient time to stop.