good evening. as we come on the air, we have breaking news in a stretch of desert outside reno, nevada. a tractor trailer mysteriously slammed into a speeding amtrak train. a giant fire ball enveloped the track. more than 200 passengers were on board the train. some have died and some are trapped. abc s lisa stark has the latest on what happened. it s supposed to be one o the most beautiful train rides in the country, lisa. reporter: i m sure it was until that moment, diane. at least two people are confirmed dead so far. many more injured. blackhawk helicopters actually ferried some of the injured to nearby trauma centers. the sligs occurred before 11:30 a.m. pacific time as the train traveled from chicago to san francisco. it was a scene of panic and chaos right off the collision. as passengers and crew scrambled to safety. tell her to reporter: the impact created a fire ball. a massive burst of flame and smoke. jim bigley spoke with abc news. my wife and i were in