The Bedford train crash that killed a driver and left scores of passengers injured could have been prevented if a safety measure to stop trains from passing red lights had been installed, it has been claimed.Safety measures designed to stop trains from being involved in accidents after passing red 'danger' signals have come under the spotlight following the fatal accident on the Midland Main Line south of Bedford on June 19.East Midlands Railway (EMR) driver Shaun Burton, 60, was killed on impact after his train crashed into the rear of another EMR train that had stopped on the same line. The front train was halted by a fault with its Automatic Warning System, or AWS.Black box data showed Mr Burton's train applied the brakes nine seconds before the collision, and managed to decelerate from 76mph to 49mph before impact.However, investigators from the Rail Accident Investigation Branch (RAIB) have found that his train did not stop at a red signal automatically activated after the front train stopped - known in the industry as a 'signal passed at danger' or SPAD.Questions have been raised as to why the track was not fitted with a safety measure that could have prevented the second train from proceeding past red signals at all.Called TPWS (Train Protection and Warning System), the failsafe is deployed on much of the UK's train network and uses trackside electromagnets to force units to stop if they pass through a red signal.But Network Rail is understood to have assessed the route as having a 'low risk' of a crash in the event of a SPAD. It views TPWS as a 'back-up' system deployed as a last resort on high risk lines where crashes are more likely. Questions have been raised over why a safety measure that could have prevented the Bedford train crash was not installed on the line Train driver Shaun Burton, 60, was killed instantly after his train crashed into the back of another East Midlands Railway unit on June 19