Coming out and shrieks. You know, loud, loud shrieks. People just screaming for their lives. Reporter glass, steel support beams and bricks came crashing down. We helped them out of the train. Reporter 34yearold fabiola, a local mother, was killed by styling on the platform. More than a hundred other injured. Some able to walk to nearby hospitals but others transported with serious injuries. I thought we were going to die. I didnt think we would get out. Reporter 13,000 commuters go through their way to and from work in new york. 1614 left at 7 23 a. M. And scheduled to arrive in hoboken at 8 38. But rather than approach at 2 to 3 miles per hour, the train never slowed. It didnt stop, it didnt slow down. It didnt brake. Reporter tonight federal investigators are examining the black box and hoping to talk to the trains engineer. Theres no real point as to speculating what happened. Why did the train come in so fast. Reporter we know new Jersey Transit does not have the automatic braking system known as positive train control, a system that can prevent fatal crashes. The ntsb has been recommending positive train control, or ptc, for 40 years. Reporter no suggestion of terrorism. Tonight the engineer is identified as 48yearold tommy gallagher. Nothing in his background that would raise any red flags, either with his employer, or for that matter, any medical issue. By the way, lester, the speed limit posted to go into the train station, 10 miles per hour. Obviously trains going a lot slower. All right, tom, we want to drill down on that Safety System you mentioned, positive train control. Its yet to be installed on an overwhelming majority of rail lines in this country. Where 1. 4 million as our Miguel Almaguer explains, critics are calling for much more to be done to protect train passengers. Reporter lessons learned. Last year in philadelphia, eight dead and more than 200 injured, a train traveling at speeds exceeding a hundred miles an hour. In chatsworth, california, 25 lots their lives, 135 hurt, when a commuter train slammed head on into a Freight Train in 2008. These, just two 145 rail accidents experts say could have been prevented with positive train control, or ptc. Year after year, were going to continue to see accidents that could have been prevented by ptc. Reporter the advanced braking system is designed to automatically stop a train before certain accidents, like those caused by speeding or ending in headon collisions. But only 22 of trains currently have the advanced braking system. While trains like this ways to maximize your safety. Experts say, whenever possible, right in the center of a train, so theres less impact from collision. And also, face the fear. So during extreme braking, youre pushed into the seat and not across the aisle. Gerald atkins narrowly survived the chatsworth crash, the deadliest in metro link history. He was seated in the first car. I always sit in the mile safest place. Reporter train travel is still among the safest ways to commute. But tonight there are more questions on how to make it safer sooner. Miguel almaguer, nbc news, los angeles. Were learning much more about the teen accused of a shooting rampage at a South Carolina school playground. Two students and a teacher were injured after the suspect allegedly killed his own father at another nearby scene. Now, as our Gabe Gutierrez tells us, police are trying to remember did what may violence. Reporter tonight in their search for a motive, investigators are looking into whether the suspected gunman may have been bullied. A source close to his family said the 14yearold was being homeschooled after he brought a machete and hatchet to his middle school earlier this year. We experienced a very devastating and lifechanging event. Reporter today an emotional fire chief described how he along with a volunteer firefighter brushed to townville, leamtary, wounded, including critically injured jacob hall, while the unarmed brock took off after the suspect. The teachers and all the responders that were on site, he immediately confronted and subdued that shooter. Reporter this mans nephew was at the playground and has a message for jamie brock. Id call him godsent hero. And thats the truth. Reporter tonight family is absolutely shocked and saddened by the senseless action says of our son. First police say the teen shot and killed his father, Jeffrey Osborn at the family home and then drove about two miles to the school. At 1 44 p. M. , they say he called his grandmother in tears. Her grandson was very distraught, she couldnt understand what he was saying. Reporter at 1 45 p. M. , shots fired near the playground. A teacher was hit in the shoulder. Protect them. Reporter administrators are crediting repeated active shooting drills with saving lives. The chairman of wells fargo faced more Harsh Criticism today over bank and credit card accounts opened without the permission of customers in order to meet sales goals. This time it was from hostile members of congress, even after compensation and one of his fired employees was there to witness it all. Jo ling kent has more for us tonight. Reporter wells fargo employees say the pressure to cell was unbearable. We were led by intimidation. Julie was a Branch Manager in allentown, pennsylvania, once recognized by ceo john stumpf himself but later fired for failing to meet aggressive sales goals. With seven checking accounts and 42 Product Solutions for my branch a day. Believes stumpf should resign and came to washington to see him in the hot seat. As you came out here and apologized and said the buck stops with me, then you should be fired because it stops with you. Again, congressman, the board has that power. Reporter house members on both sides pressing the ceo to take more responsibility. Did wells fargo employees steal from a million to two million other customers . Yes or no . In some cases, they did. Reporter no fargo has paid a 185 million settlement. Today stumpf revealing he first learned of the problem in 2013. We begged and pleaded with family members, with relatives, with business owners, just to open accounts so that we wouldnt lose our jobs. Reporter consumer advocates say what happened at wells fargo could happen anywhere. Check your credit card statements every month. Reporter today the ceo announced that we f its aggressive sales goals on saturday, thats three months ahead of schedule, but lawmakers say thats not enough. Jo ling kent, nbc news, washington. Some 20 Million People under flood alerts up and down the east coast. In north carolina, ten inches of rain fell in some areas. And rescuers went door to door saving people who were stranded. The threat continues into the night. They expect another three inches or more to fall all the way up to pennsylvania. The weekend is northeast. We turn now to politics, where it got even more personal today between donald trump and Hillary Clinton, with bill clinton now emerging as fair game in the trump playbook. Then there was gary johnson, the thirdparty candidate and the tough time he had last night. We get more tonight from nbcs kristen welker. Reporter Hillary Clinton in iowa today, bracing for an onslaught of new attacks, with the trump team signaling theyre poised to past indiscretions. Whats your response today . He can run his campaign however he chooses. Thats up to him. Reporter in the debate, trump stayed away from bill clintons past, but nbc news has obtained a trump surrogates talking points memo, telling them to talk about clintons infid infidelities. Trump today in New Hampshire trying out a new attack line. Follow the money. Reporter but backstage with way reporter, pressed on the strategy of dredging up the clintons history. Clinton anyway . Well, youll have to figure that out. I think its Pretty Simple to figure that out. Possibly in the next debate, fair game . Well see what happens. Were going to see what happens. Reporter secretary clinton with reporters dismissing it all. He can say whatever he wants to say, as we well know. Reporter meanwhile, another challenge from clinton, the threat from thirdparty candidates, the gary johnson effect. Johnsons drawing support from clinton, particularly with young voters. But hes also struggled recently, faltering on Foreign Policy with msc whos your favorite foreign leader . Who is my favorite just anywhere in the country, any of the continents, name one foreign leader that you respect and look up to. Anybody. Name a foreign leader that you respect. I guess im having an aleppo moment. Im giving you the whole world. The former president of mexico. Which one . Im having a and this gaffe could help that along, thats great news for Hillary Clinton. Reporter as for donald trump, who has been married three times, its not clear his strategy of getting personal with the clintons will help him win over women voters, the very voters he needs more of, in order to win the white house. Lester . Thank you, kristen. Now to an nbc news investigation into whats being called a secret campaign to influence americas president ial race. Have come under attack by hackers andas numbers news Senior Investigative correspondent Cynthia Mcfadden tells us, officials are pointing the finger right at russia. Reporter intelligence sources tell nbc news, theres no doubt the russians are trying to influence the president ial election. Nbc news has examined the classified materials used by those who briefed both hook and donald trump. Has drawn direct links between the u. S. Government and hacking activity against the 2016 election, only 39 days away. According to two sources at the department of homeland security, there have been attempts to hack the election systems in at least 20 states. We are doing an awful lot of work through our counterintelligence investigators to understand just what mischief is russia up to in connection with our election. Reporter nbc news has also learned from a senior u. S. Intelligence source that inside a secure Briefing Room this summer, admiral National Security agency toll the congressional intelligence committee, we believe potential adversaries might be leaving cyber fingerprints on our critical infrastructure, partly to convey a message that our homeland is at risk if tensions ever escalate towards military conflict. In other words, a warning from the russians. Senator Diane Feinstein and adam schif issued their own intelligence agencies are making a serious and concerted effort to influence the u. S. Election. This effort is intended to sew doubt about the security of our election and may well be intended to influence the outcomes of the election. If were even talking about russian influence in the election, thats a problem for people accepting the credibility of the results. Reporter but even russias success in creating doubt is still a long way from changing the outcome Cynthia Mcfadden, nbc news, new york. Still ahead, a new government warning about the flu that every parent will want to know about. Were back now with a new warning from Health Officials as we stand on the brink of flu season. The cdc fears more children may get the flca get the best protection this year. Reporter for 5yearold joseph morada, it happened so fast. A simple case of the flu quickly sent him to the hospital. And then he ghot worse. The attending doctor came in and i looked at her and i said, i cant hold my to come in the room with me. Reporter joseph died of a flu strain not covered in the vaccine he received. That strain is now covered in this years shot. Get a shot. Reporter today top officials worried about children getting vaccinated because they can no longer use the flu mist. Everyone ages six months or older needs a shot. The flu vaccine lowers your risk by 50 to important for the atrisk population. Reporter sar ease runs a group called families fighting flu, and getting their daughter vaccinated is a family event. We want families to understand that this can happen to you. Reporter an important reminder, last year, more than half of americans failed to get a flu shot, taking a potentially deadly risk. Dr. John torres, nbc news, syracuse, new york. We are back in a where his mouth was a Golden Moment at the white house today as in olympic gold. President obama welcomed team usas olympians and paralympians to the east room, to congratulate them on their performances in rio. Most of the final five were there. Star gymnast simone biles getting to rub elbows with the first lady and ledecky among those getting a special shoutout from the president today. Little kids at a party, something every parent can relate to. Only today it was the royal family on their visit to canada. Prince george and Princess Charlotte attended a party complete with pony rides and lots of balloons which charlotte couldnt get enough uof. Two dozen of them from military families. Rory mcilroy and stenson couldnt stivg a 12foot putt. A fan shouted that he could even he could make the shot. So they pulled him on the green, gave him a putter, and look at that, the fan showing the pros how its done and earning the admiration of some of the worlds top players. You think hes got a great story to tell . When we come ba enough of this scene finally tonight, what has become a mustsee tv phenomen world, are watching the live feed from a camera fixed on an intersection in jackson hole, wyoming. What could possibly be so fascinating . We sent harry smith to find out. Reporter jackson hole, gateway to the tetons and yellowstone. Jawdropping vistas and an eyeful around every corner. But on any given day, go figure, hundreds, even thousands of people around the world are looking at intersection in wyoming. For reasons we wont pretend to understand, watching this camera has suddenly become something of a thing on youtube. With running commentary from viewers who seem especially pleased if a red truck goes by. Were guessing this might be part of the slow tv movement. On netflix, you can watch people knit for hours. A big favorite is the fire. Think of it as a yearlong yule log. Thrilled with the newfound attention, responded by performing for the camera. Heres the dancing sheriff, and the creative types, tried a miniature marriage proposal. Viewers at first were pleased. But then they were like, thanks for entertaining us, but give us back our boring intersection. [ laughter ] and that was very unexpected. We thought we were providing some genuine entertainment. Reporter and so there it is, traffic and tourists to transfix a global audience. Their own time . I feel like they should do something else. [ laughter ] reporter it all gives new meaning to the old saying, theres nothing on tv. Harry smith, nbc news, jackson, wyoming. Almost as fun as watching paint dry. Thats going to do it for us on a thursday night. Im lester holt. For all of us at nbc news, thank you for announcer bill engvall is back and trying to tackle his biggest fear. And thats my cue. Announcer can phobia expert gary coxe cure him. She went from modeling to with no excuses. And the spray that could spice up your sex life in minutes. And a tv stars Sexual Assault claims. The results are horrific. Announcer all new today on the doctors [ crowd cheering ] [ applause ] . . Dr. Travis hello, everyone. Welcome, you know they say laughter is the best medicine, and we have your daily dose here today. We will give it up for a special cohost, funny house [ crowd cheering ] [ applause ] you are gonna be hardpressed to outdo your last performance. You had us going pretty good. I felt bad for you, you were going through kidney stones last go around. I gotta tell you, the stones were not as bad as the humility i had to go through, because a, they i had a catheter, which i, yeah, yeah, you dont want that. [ audience oohs ] i get the kidney stone, i i said, should i pass if some he said, normally, but he said bill you have a very small urethera. I am like, how do you even respond to that . [ laughter ] the urethera is the tube that carries the urine from the bladder out, so, is it just like the opening hole thats really small . Again, i really didnt go into that. Dr. B, you are not helping here. You are supposed to say the urethera has nothing to did to do with the male pene issize. It penis size. You are just not gonna give it up, are you . Who likes candy . [ laughter ] the worst part was, the stone wouldnt pass, so they put me under to do that procedure where they go in and try to get it. So i come out, and i said, did you get the stone . He said i have never had this