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Off the track and then they pulled the locomotive off behind them. all of this is the physics of a crash like this. and this is why investigators knew from the very beginning that they had to look at this pattern of the wreck itself and the video and say, maybe this train was just going too fast. >> all right, tom. thank you very much. pretty incredible. it does remind everyone of that crash in spain, a very similar situation. coming in at a similar speed to a curve with the same speed limit. and obviously the fatality rate there was incredibly high. "outfront," matthew wall transportation saf...

Two years ago a metro north train derailed in new york after going into a curve at nearly three times the speed limit. right after the "today" show's jeff rosen showed us technology could have prevented it from happening. >> state-of-the-art collision avoidance technology. >> it's called positive train control, or ptc. a sophisticated system of sensors on the rails and inside the locomotive even using satellites to track the train's movements and prevent many accidents caused by operator error. if the train is going too fast the computer warns the crew. if the engineer doesn't slow down, the c...

Important to them. they'll have an opportunity to take a look at the scene, collect some perishable evidence. do documentation and gather the recorders, both the event recorders and the video recorders that might be on board. >> absolutely. there are some passengers on the train that said there were announcements saying there was no air conditioning on the train due to electrical problems. some of those comments are coming in. is that something these investigations will look at as well whether an electrical problem could have been involved from the start? >> absolutely. there is lecrification ...

So why not skip ahead to the fun part. >> that's not a hill. >> that's not a hill. >> welcome to today's ground. >> why does everybody tell me my questions are great, the answers are sub par. [ laughter ] >> this is what we are working on. we're working right in this area first and then do some ascent and descent. and that's the plan for the day. >> first order of business, brushing up on knots. first knot we're going to learn is a water knot. >> all the way around? >> yep. >> okay, the double fisherman's knot, sliding rope under the x. >> we spent a long time on knots. >> the figure eight. fi...

New information may lead the ntsb to reopen the investigation of the 1959 plane crash that killed rock and roll ledged buddy holly, richie valens and the big bopper. it's said that equipment errors may be to blame not operator error. some of us know of this tragedy because of the song "american pie" the day the music died. >> the musical legacy. the truth can never come you know whenever it comes, it's good enough for them. the iranian foreign minister says a nuclear deal with the u.s.? very close. christianne amanpour sat down with the foreign minister with an eye-opening interview, why is ...