CNN The Lead With Jake Tapper May 14, 2015 20:16:00
Welcome back to "the lead." i'm jake tapper. breaking news coverage on our national lead. the stretch of track where amtrak's train went airborne missing a key meese of technology called positive train technology. all passenger rapes in the united states arethe -- trains are supposed to have this installed by the end of this year. amtrak's ceo says it could have prevented this accident from happening. tom foreman is standing by. explain this for us. what does positive train control do? >> positive train control, jake an idea around about 25 years. putting it in place is not just a budget issue...
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