crash. an automatic braking system wasn't installed on the treach of rail where the in the dent occurred. the technology is to be in place by end of 2015. u.k. rails are operating a lower tech version of the automatic blakes. phil black explains how they work. >> reporter: west london, september 1997. a passenger train and freight train collide killing seven, injuring more than 100. two years later, another collision. involving a passenger train in london kills 31 people. these accidents refocused safety efforts on the british rail network. >> a matter of the will, really, from, from, the country as a hole. >> the chief of safety on britain's rail network says it led to a system now rolled out in high risk areas across the country. >> it was deemed the technology was available to overcome human error. >> reporter: called train