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Correct 35— 40 years of trees growing overnight. it's a historical crack. if you look at pictures on our railways in glendive 1940s crack. if you look at pictures on our railways in glendive1940s and �*505 our railways in glendive1940s and �*50s and steam engines were about there were trees. they kept the banking clear because of the fire risk. 0nce steam engines a british restaurant be cutting back on budgets to save money and trees grew up, and as a result of that historical quirk, we have got lots of trees where they never were and actually now shouldn't be as we are finding our cost....

We want to make certain that there's not an increase in the rate. i don't think so but we haven't seen that data yet so for me that's the only real safety question and then the -- whether or not they make the recommendation universally is going to be very important to see. >> very important to see. no question about it. dr. hotez, we appreciate it. >> i appreciate it. >> thank you. coming up, new evidence that north korea's expanding the nuclear program. we'll g you the latest details and new satellite images right after the break. bon appetit. hey kim, you earn 5% on travel purchased throug...

>> reporter: yeah, absolutely. the governor has been making this a political issue. she's been tweeting about it almost weekly. we had a fresh tweet yesterday. the issue here is really a safety question. the national parks service said there shouldn't be fireworks. there is a high fire danger. the governor said that should be overruled. a federal judge said she did not meet the bar to overturn the national park service's decision. what affect that has on tourism, one business owner worries it will turn folks away from coming next year. take a listen. >> but there are no openings in any of the ...

Ptc forces speeding trains to automatically slow down. >> the locomotive was in the process of getting ptc, a system of ptc installed, but it was not yet functional. >> reporter: positive train control won't be the only safety question. >> i'm an advocate for safety. i'm not so concerned about the cost, if you can't afford to do it the best way through our community, i'd rather not have it there. >> reporter: the mayor don anderson and the city council fault to stop the train line citing safety concerns. $180 million spurred washington state to move the line from the sparsely inhabited coastli...

Run on a new passenger route, the train sped at 80 miles per hour, much faster than the posted 30-mile-per-hour speed limit for the curved section of track. investigators already recovered the train's rear black box. and they also know this. life-saving technology called positive train control, was not activated on this brand-new passenger rail line. ptc forces speeding trains to automatically slow down. >> we're going to find out exactly what ptc or positive train control would have prevented this accident. it's a great disappointment that positive train control has not been implemented in ev...