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Freight trains do that. passenger trains do that. it just so happens that csx is who owned this particular stretch of the track. >> to have two deadly crashes in less than seven days, it's difficult for people who look at this and say the rail system in the united states is as it should be. what message do you want to send right now to train travelers? >> well, i think that we've got to look at each individual accident and decide what's going to there. on wednesday, it appears that somebody had a garbage truck on a railroad track and hit it. today we're looking at different circumstances down ...

>> none whatsoever. >> you said this crash was preventable. how would positive train control have stopped this? >> it is designed to prevent four types of accidents. this is exactly one of those four types of accidents that it is designed to prevent. >> and how so? it gets sensors. it gets data from ahead of where it is on the track and automatically without people on the train changing things, it would slow the train down. is that how it works? >> yeah. that's pretty much it. it knows where the train is, what the signals are showing, what the switches are doing, the rail switches are doing. a...

Amtrak train crash in less than a week. investigators say the train in south carolina yesterday was on the wrong track and slammed into a freight train killing two people and injuring more than 100. it came less than a week after another amtrak train carrying republicans to a congressional retreat hit a train on the tracks in virginia killing one person and injuring several others. give us more details on this one, jonathan. >> hi, melissa, a terrible accident renewing calls for safety on america's railways. there is a gps-based safety system called positive train control or ptc, mon is torg t...

Curve. sunday's accident has renewed calls for positive train control or ptc, safety technology that can reduce train speeds based on real-time track conditions. >> fully operational train control system could have avoided this accident. that's what it's designed to do. >> originally supposed to be fully installed by the end of 2015, congress extended the deadline for implementation to the end of this year with the possibility of further delays. >> it is so important in this country that ptc be implemented by the end of the year and that we don't give any more extensions. >> the ntsb says trac...

Welcome back. you're watching msnbc. it may be months before investigators know exactly what caused the switch error behind this weekend's deadly train crash down in south carolina. the head of the ntsb says positive train control technology likely would have prevented this tragedy. two people were tragically killed and more than 100 hurt. nbc's maya rodriguez is in lexington county, south carolina, near the crash site. what is the focus for investigators today? >> the ntsb is going to be looking into a couple of things today, stephanie, was this human error, as well as the mechanical conditio...