For three quarters of century, safety experts work to keep trains, vehicles from colliding.
Gunby
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D000063:Accidents, Traffic / Q000401:mortality / Q000517:prevention & control*; D006801:Humans; D011890:Railroads / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology; D014947:Wounds and Injuries / Q000401:mortality