has been falling hard most of the day. hard for drivers to see the lanes near frisco and the storm also causing travel problems out at dia. >> so true, karen. hundreds of flights at the airport here in denver have already been cancelled. we'll have a live report from dia, a bit later in this newscast, first, we want to check the current conditions. our mark taylor will be updating the drive home, there's that green in the weather center, get a lot of snow just how long this storm is going to last. want to start with meteorologist justin mcheffey in castle pines, hard to figure the snow picks up, slows down, but it's going to get worse, right? >>reporter: we think the later we go tonight, jim, the heavy owe the snow will become. take a look over my shoulder, southbound i-25 is a jam at castle pines parkway, there was an accident further down the rooshgsd but traffic volume is still high. since we pulled up two hours

conditions cycle from wet to icy, back to wet, back to icy. and that's because after the plows moved through and treat the roads, those chemicals only last so long. so obviously, the later we go tonight, the colder the temperatures get, and the more common icy road surfaces will become. a quick measurement here in castle pines, coming up on 3 inches of snow here. i think at least in the next couple of hours, we'll see the snowfall increase along here along the palmer divide. a quick check of the road condition, icy, 32 degrees. and the air temperature outside is 24. a pretty pronounced up slope starting to pick up from the northeast. you can see a little bit of in this light snow now, fwhut thing is getting start -- but this thing is getting started. >> as we take a look at our map, you can see the pink shaded area is the winter storm warning, covering all of the state, except for the northwest, where they're under a winter weather advisory, as for as the amounts

because we haven't seen a whole lot of know today, i'm backing off on these amounts just a little because we thought we might have 2-3 already on the ground. down over the southern mountains, impressive amounts, up to 3 feet of snow could certainly fall. as we take a look at what we've got going with this storm, fl the great lakes region all the way down to arizona, so this is just a huge storm around here. but here's what is starting to bother me. low pressure has not gotten into the position to give us an easterly wind, that's what we need for the up slope, but take a look at the dry air, working its way in to the storm. if we don't get those easterly winds and this dry air keeps feeding into the storm, we're not going to see a lot of snow. you're saying the try air lead into the storm, now you see t another batch of snow coming from the south. these storms are never easy to forecast. and this one isn't making it easier. but we will give you our best guess of exactly with what's going to happen and how much snow we're going to see. >> all right. thanks very much, ed.

get worse as the night goes on. >> and cdot crews are out in force with you. the roads in red, really backed up. there's a few spots there. cbs4's mark taylor joins us live tonight, and how is it on the east side of town? >>reporter: well, the crews are working on that right now, karen, even before the snow started to accumulate, cdot crews were out using materials like mad chloride to help with the traction. this tanker has the ability to treat 3 lanes at once. now, cdot crews say they're more than ready for the winter storm with more than 900 plows all across the state, working on 12 hour shifts. crews will be focussing on metro denver, the mountains and the eastern plains. wherever this snow is hitting the hardest. this will also be the first winter storm we see the snow monitoring system. >> you know, this system helps us by allowing us to better understand exactly what's happening in our vehicles, so how much gas we're using, where we're going, if routes that we're travelling, even

have in trucks. >>reporter: now, denver public works is also on full snow patrol, even implementing the residential snowplow plan for the second time this winter, which means residential streets will be plowed as well. both cdot and public works will continue to work until the roads are cleared. possibly into wednesday. live in aurora, mark taylor, cbs4 news. . thank you, mark. the snow real piling up in colorado's high country, a rash of accident has caused cdot to close parts of i-70 during the day. matt is live in frisco, how are the roads there? >>reporter: well, we know that the surfaces here are icy and snow packed but traffic is moving at least into town, but when you get on the interstate, things are icing up. i want to show you what things look like at ten mile creek, the only water, unless you're talking about somebody's hot tub that you're going to find, because those temperatures are drop canning the snow keeps falling,

here in frisco in summit county, great for ski sxers snowboarders, just talked to a group that got off the mountain, the conditions were awesome. but that visibility definitely starting to deteriorate as another wave of snow moves into summit county. definitely a winter wonderland for folks out here, seeing folks walking around and trying to enjoy the snow as much as they can. but definitely more snow on the way. we're live in frisco, cbs4 mountain newsroom. well rs let's hope this is not an omen. the broncos road to the super bowl involved a fender-bender today. >> demarcus ware tweeted about it. the south bay, d. ware got out, took a photo, the crash is very minor, none of the players were hurt. from the helicopter, you can see the cracked windshield on the bus. all the plays returned to the hotel. >> we want to head to the center in san jose, mark haas is right now. mark.

you guys are talking about, it's nice, sunny and almost 60 degrees here in san jose, this is the kickoff to super bowl week, what used to be known as the tuesday media day, is now a monday night opening night. in just about an hour here at the sap center, lit be filled with players, media, and fans. it's quiet the pruk, about a dozen broncos at podiums. each team is here for an hours. 5:15 local time, 6:15 mountain time. heres was the scene in 2014. the last time the broncos were at the super bowl. for a lot of guys they are used to this routine. we'll see if anybody creates any big headlines with the answers they give. every player has to attend or else they will be fined. but you knew that, thanks to marshawn lynch who stole the show last year with his brief appearance, telling us exactly why he was there. >> hey, i'm just here so i don't get fined. i'm just here so i won't get fined. i'm here so i won't get fined.

i'm just here so i won't get fined. i'm just here so i won't get fined. hey, i'm just here so i won't get fined. >>reporter: classic. check out boomer a sie. talking about broadcasting super bowl 50. 19th time cbs has had the super bowl. the most of any network. jim nans was missing from the network because of a birth of a child. there's a lot of people in denver who are not fans of sims, but maybe they're just the vocal minority because phil says he feels the love in denver. >> you know, i know this, when i'm in denver, i take more pictures and sign more autographs there than any other city that i go to. so i don't know if they're taking those and throwing things at them, they might be, that's the way it is. and i'm not going to say that the denver fans have -- i've heard this more from them,

going to start naming all of the citiess that don't like me. >>reporter: and guys, i'm just here so i don't get fined. we'll see you again in a little bit. >> thanks, beast. well, super bowl 50 is this sunday, right here on cbs4, the coverage gets going at 4:00 p.m. . right now, new information on a deadly shooting during a motorcycle show at the national western complex. that man shot to death saturday during the biker brawl, has been identified today as 46-year-old victor mendoza. it's believed he was a member of the mongols motorcycle club, and an attorney for the club released a photo showing a man with one club called leathers of the iron order. holding a gun at the top of the stairwell. that attorney says the photo was taken after one shot was fired, critically wounding a mongols member. and just before mendoza charged, and was shot in the chest.

the zika virus, the world health organization calls it an international emergency it felt mosquito born illness has been reported in south america, mexico and puerto rico, travel warnings are in place, especially for women who are pregnant. health specialist cathy walsh joins us now. a couple from thornton had to cancel a nonrefundable trip. >> back in april, they planned for the trip, but they didn't plan for michele to get pregnant or for puerto rico to be a hot spot for the zika virus. >> said it was excellent. >>reporter: alex and michele had big plans for a family get away. they were going to pack up little jackson, and catch a plane to a resort in puerto rico. but they will only see it in pictures. >> bedecided not to -- we

>>reporter: there are warning about the zika virus, it affects more than 20 countrys and territory, including puerto rico. it's been linked to a devastating birth defect. a zung --. so they asked travel lossty for a refund or at least a credit. >> could they do anything? >> nonrefundable and nons >>reporter: out $1600. alex contacted cbs4. called them, and while we were e-mail. it promises a full refund once they send a doctor's note. >> high five. >> all right. >>reporter: lessons learned. read the fine print. and a little help can't hurt. i asked a spoebs man if a -- spokesman if a full refund will be the policy in similar case, he says no, this is a case by

reporting live, cathy walsh, cbs4 news. and we continue to follow that weather alert for you tonight, slow-going now for those trying to get home in the snow. and ed, this storm will be with us for a while. >> it will. as we get going here, you can see we've got off and on snow, here's the off band, it is already dry right here and now we have some snow that is beginning to move up and fill in from the south. so i think the snow increases as the night goes on. goes through the night rs goes through most of tomorrow, the hour-by-hour, will show you the time line of this storm. also coming up, travel plans grounded here in denver, the storm's impact out at dia. . >> and the first votes of the presidential race will be cast, starting in less than an hour. we'll have an iowa update for you. . >> cbs4's drive to the championship coverage is brought

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,, ,, ,, ,, following that weather alert tonight, snow is falling, a live look for you from the mobile weather lab. we also understand northbound

stay away from that area. if you can, and it's coming up in a few minutes sglchlt and happening tonight, the first votes in the 2016 presidential races will be cast in the state of iowa. the caucuses there begin at 6:00 p.m. our time. democrats and republicans g gather at nearly 2,000 locations to vote. the candidates and their supporters made one final big push today. look for coverage of the results tonight on cbs4 news at 10:00. with our political specialist shaun boyd. now back to our weather alert, how this storm has already impacted a bunch of flights out at dia, airlines cancelled hundreds today. our jennifer brice joins us live at the airport, jen rs we could see problems tomorrow, too. >>reporter: that's right, you know, karen, about a third of the flights out here today are cancelled. but we're not going to know about tomorrow's cancellations until we see what the storm does tonight. of course.

before you even head out to dia. >> frustrated. we are frustrated. so just have to make a decision what to do. >>reporter: havlers at denver international airport are arriving to find that 500 flights have been cancelled monday due to weather. cam says her airline though was proactive and called her. >> i was on a 2:00 o'clock flight to chicago, that was cancelled, they rebooked me on a 3:00 o'clock. i'm here early, i'm going to try to get in. >>reporter: as the storm progresses in the night, travelers will have a better picture of how their plans to up. the airport suggests people call their airlines before even heading out the door. >> some of the airlines might also be offering change fee waivers, to allow you to reschedule your travel plans without a financial penalty. so check in with your airline for that. >>reporter: marine greene and her husband say they're looking at all options because being stranded in denver 3 days, like united as told them is not an

>> rent a car and go home, but rent a car, you know, we will be home probably next -- tomorrow. >>reporter: it is so cold out here, i've got to tell you. i do want to mention to folks, all of the planes are being deice asked that because of that, they hope that people will get to the airport a little bit sooner if their flights are not cancelled. they like to accommodate the 15 minutes it takes to deice before they take off. thank you. head west and you're going to see heavier snow. the snow piled up in steamboat springs and don't forget, post your snow pictures on the cbs denver facebook page. ed is back with more on the weather alert. >> we're watching this one very carefully and you've seen the areas of dry pockets. we're starting to see more heavy snow, watch it filling in around

heading our way. we've got to get that easterly flow to get the up slope in here and that might be happening. we will see an increase in the snow over the next few hour, a low pressure system here that's about to get in the right position, that would be southeastern colorado or the oklahoma panhandle. and then that will give us that up slope flow, that easterly flow can once it turn, then the snow gets heavy, 4-6 inches overnight. so here it is on the hour-by-hour forecast, you can see the heavy snow over the east and that continues right over the metro area. 5:00 a.m., that's your morning rush hour, heavy snow over the metro area, to the northeast. and you can see the 5:00 o'clock in the afternoon, just a couple of snow showers still lingering for that rush hour. remember, there will be fresh snow on the ground. and by news time tomorrow, 10:00 o'clock, you can see we're starting to see clearing skies along the front range. then it's finally out of here. looking at about 6-10 in the greater metro area. to the southwest, they could get up to 3 feet of snow in some areas.

and down to the south, maybe 12-26. high today, 30 degrees, downtown, just 29. didn't move much from the morning lows of 24 and 23. 44 and 17 would be normal for this time of the year. 73 and 25 below are the records. 27 and 28 right now, the east wind at 20. there's the easterly wind, we think will start to push the snow in here. 85% humidity, a lot of moisture in the air. and the barometer is on the rise. as far as the temperatures go tond tonight, teens and 20ss over the eastern plains, we're looking at single digits for the most part, with the higher elevations and out west, single digits and teens, and then tomorrow, we're going to have another chilly day around here as the snow goes with temperatures only in the 20s over the eastern plains. teens for the higher elevations,s 20s to around 30 degrees as you head to the west. all right. here is your forecast now. for tonight, we'll look for snow, could be heavy at times, 18-and 16 the overnight lows, then for tomorrow, snow gradually increasing, after 6-10 inches piles up here in the metro area.

and then we slowly begin to warm it up. 28 on wednesday. fwut sunshine returns -- but the sunshine returns. 35 on thursday. friday on 40. a seasonal die on saturday. >> we will be ready for seasonal. coming up in sports, inside of the super bowl media day. >> one of the broncos weighs in

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championship coverage is brought to you by southwest airlines. . media day. >> oh, my gosh, i think the players kind of, well, who knows if they like it or not. we know kelly at the the sap center in san jose for all of the action tonight. kelly. >>reporter: jim and karen, i've got to say there's a lot of action happening here and there's a lot of fun. it is a lot of work, work, for this sports team ahead of super bowl 50, but we're all enjoying it and i know the fans who are flooding here as well. outside of the sap center here in san jose, a lot of activity, we've seen it all day. outside, tents being pitched. food trucks and media has been staging all around the place, i don't think i've ever seen so many satellite trucks in one place. now, this is a big day, ahead of nfl's opening night tonight. fans are slowly coming by as well, anxious to see some of their broncos favorites.

play football for my high school and i got 58 because my idol. favorite play r. so excited. >>reporter: and outside the broncos hotel in santa clara, the media tent is almost ready. curtains are going up and microphones are in place thflt kubiak and peyton manning tomorrow morning. and on those smaller sets inside of the tent, there are ten select players who will do interviews as well. we can expect to hear from players, like aqib talib. we caught up with broncos defensive back omar bolden, we and i talked football, the plane ride and what the heck was up with cam newton's pants. >> no zebra pants for you sno. >> no, that's not my style, that's not my style. i don't have anything to say about the pant style, that's not mine.

thanks to a lot to him for meeting with me. we have a lot more at 6:30, fashion and football, jim and ka,, ,, (donkey sound) (elephant sound) there's a big difference between making noise, (tapping sound) and making sense. (elephant sound) when it comes to social security, we need more than lip service. our next president keep social security strong.

enough talk.

we had a little break, it is picking up again. >> that's right, take a look at the radar, you can see there is drier air pushing into this system. but to the south, heavier snow. 4-6 inches overnight. and it tapes off tomorrow . sunshine returns and we begin to warm up to near seasonal by the weekend. >> all right. thank you, sir. >> and thank you for watching

>> peyton manning is on the cbs evening news, coming up next, and speaking about the broncos, there it is, super bowl city, a live look from the city by the bay in san francisco. a lot of the action tonight, >> pelley: the last push for the first votes. >> if you're in bed, if you're sick, if you can't walk, if the doctor says you cannot leave, i don't care. >> i hope you will fight for me. >> stand for us. >> let's go get 'em. >> pelley: it's caucus night in iowa. also tonight, we're at ground zero of the zika outbreak, now an international health emergency. the last thing the engineer remembers before the fatal philadelphia amtrak wreck. and peyton manning on the super bowl and h.g.h. >> i welcome that investigation. captioning sponsored by cbs this is the "cbs evening news"

>> pelley: tonight iowans will gather in churches, schools and homes to reason, to argue and to vote in the nation's first contest to pick presidential nominees. each party has two front-runners essentially tied. this is only the beginning, of course, of a process that lasts into june, but these caucuses have never been more important. with three major candidates trying to turn the process outside-in -- trump, cruz and sanders, outsiders, testing establishment candidates, ng including clinton. we have a team of correspondents. first we'll go to major garrett with the republicans tonight. major? >> reporter: scott, to win donald trump needs massive new turnout, thousands of voters participating statewide. four years ago turnout was about 122,000. ted cruz is betting everything here, his massive organization can withstand voter turnout up to 170,000, but beyond that, it is trump's game and trump's

>> good morning cruz crew. it's the day we've been waiting for. >> reporter: before dawn, ken brolin woke up 130 ted cruz volunteers living in this apartment complexes known as camp cruz. >> we give this our all for one more day and we can be proud of what we did here. >> he is real. >> reporter: cruz volunteers worked the phones all day sunday at the campaign headquarters outside des moines, part of the largest mobilization effort of any g.o.p. candidate. cruz himself visited his 99th and final iowa county today and called the race a statistical tie. >> i got to tell you, this race right now is neck and neck. it's all about turnout. >> reporter: donald trump holding a small but significant lead on cruz said he was nervous facing voters for the first time. >> win, lose or draw, i love you folks all. i love you all. >> reporter: trump also warned

federal ethanol subsidies that cruz is no friend. >> he will destroy your ethanol business 100%, 100%. >> thanks for everything. >> reporter: marco rubio who is hoping a late surge will translate to a strong finish exhorted volunteers and took selfies. >> we're ready for whatever happens tonight. we feel positive about it. i ask everyone to go out and caucus, especially if you're supporting me. >> we're volunteers of ben carson's campaign. >> reporter: supporters of ben carson who has sagged in the polls knocked on doors in one last gasp for support. and rand paul met with dozens of his young volunteers. >> we're going to do very well. we're going to beat a lot of people in the race. i think there is a chance we can win. >> reporter: rubio could be the one to watch, scott. his crowds have grown by hundreds down the stretch, and a strong finish could be a spring board to new hampshire, where other rivals for the so-called republican establishment vote, john kasich, are already waiting. >> pelley: major, thanks. now the last pre-caucus poll out today shows the democratic race

statistical dead heat. clinton hopes to redeem her loss in iowa eight years ago. nancy cordes is there. nancy? >> reporter: scott, clinton came into iowa with all the advantages -- money, staff, years of planning. tonight we find out if it is enough to fend off a former underdog who, like her opponent eight years ago, has taken on an iowa with a message about >> i really appreciate all your help. >> reporter: there was nothing left to do today but thank supporters. >> let me thank not only all the volunteers... >> reporter: the phone calls have all been made. >> would you be able to attend? >> reporter: the doors have all been knocked on. >> i will be caucusing tomorrow. >> for bernie? >> bernie, yes. >> excellent. >> reporter: and no one has any idea who will come out on top. >> we got a tie ballgame. >> reporter: vermont senator bernie sanders has closed a 40- point gap in six months. >> the adrenaline is flowing, yes. >> reporter: win or lose, he has

inevitability. what was the point that you thought, i could really be a contender here? >> well, when we started to bring out really, really large turnouts, you know, in des moines and iowa city and people that's a really, really big turnout. >> reporter: clinton, by necessity or design, has done smaller events. already made a phone call or knocked on a door? >> reporter: making more time for the kind of personal interaction iowans see as a birth right. the candidates' closing arguments could not be more different. >> stick with me. stick with the plan. stick with experience. >> it sounds like you want to make a political revolution. >> reporter: their face-off has left former maryland governor martin o'malley a distant third. if you don't change the dynamic here, what happens in new hampshire? >> we... look, you have to ask me that after monday night.

survive a loss here in iowa, but it wouldn't be much fun. sanders is leading in his neighboring state of new hampshire by as much as 20 points in the polls, and if he wins, scott, clinton won't have chance to redeem herself until south carolina at the end of the month. >> pelley: nancy, thank you. it's worth remembering that only 30 delegates are at stake tonight. it takes many hundreds to win either party's nomination. john dickerson is our cbs news political director and anchor of "face the nation." he's in iowa talking to iowans. john, iowa's conservatives are about as conservative as they come. tailor-made for cruz. what if he comes in second? >> it would be a blow. his campaign is always predicated on starting and doing well in iowa. that is because it's tailor-made for him there. there are so many evangelical voters here and conservative voters. his entire campaign is built around this idea that he can build a conservative revolution. if he can't do that here, it calls the whole thing into question. but he has about $20 million

future contests in south carolina and then a number of southern states on the first of march that would do well for him, so if he comes in second here, he could mount a comeback in those states. >> pelley: it also seems that iowa's liberals are tailor-made for sanders. of course, he'll do well in new hampshire next to his home state next week, but what about the later primaries for sanders? >> reporter: those later primaries, the electorate is less liberal. hillary clinton has better organization in those states, so it's harder for sanders to build the kind of emotional support and wave that he's trying to build here in iowa. that's why iowa is so important. because if he can't do it here, he's not going to be able to do it in later states. >> pelley: now major was just telling us mainstream republicans are fighting for third place. why does that matter? >> reporter: well, those mainstream republicans, and here we're talking about rubio, bush, christie, kasich, they've been trying the find some reason to break out of the pack and say i am the lone alternative to donald trump and ted cruz. so they've grabbed a poll. they've talked about a debate performance.

break out of the pack. if they can point to a strong result in iowa, third or maybe second, they can say the voters have validated me and now all mainstream conservatives should rally around me to go up against trump and cruz. >> pelley: john dickerson, see you on "face the nation," thanks, john. now, we are thrilled to welcome back to the evening news man who has covered every presidential election since 1968, our very own bob schieffer. bob, how does this one look to you? >> reporter: thank you, scott. i have to say, primary campaigns are like weddings, they bring out the best and worst in families. if this campaign were a wedding, we would be half-way through the weird uncle's long, unfunny and embarrassing rehearsal dinner toast. the difference here is all the participants in this campaign appear to be stone-cold sober. that may be the scariest part of all. people are madder than ever, the partisan divide is wider than ever, and we're seeing a campaign reflecting the changes

social media. nasty, illogical, ill-tempered, strong on attitude, light on issues. too many times people have arrived at this wedding with not just opinions, but their own set of facts. the campaign narrative has gone from inane to profane, more like a thread on a blog post than the usual campaign rhetoric. you're a jerk. well, you're a bigger jerk. no, you're a blank, blank jerk. inspirational? not just yet. but there is light at the end of the church. in iowa tonight, as the candidates finally begin their long walk down the aisle of the caucuses and primaries, we'll finally start the hear from another group -- voters. and scott, that's a good thing. >> pelley: and you'll be with us day. bob, thank you. tonight on the caucuses during prime time programming.

and "cbs this morning" will have the very latest tomorrow. snow is on the way tonight in iowa, but not until after the caucuses. california got hammered by weather the past two days, and san diego and eight-foot-wide oak fell on a car and killed a woman. wind gusts were reported as high as 115mph. to the north i-80 was shut after a pile-up of 29 vehicles. this system could dump a foot of snow on denver. in another major story tonight, the world health organization took the rare step today of declaring zika virus and its suspected link to severe birth defects an international public health emergency. the outbreak started in brazil and our doctor jon lapook is there tonight. jon? >> reporter: scott, i spent the day at this hospital in recife, which has seen the most number of cases of microcephaly in all

the couple i spoke to was anguished as they tried to figure out what this condition means for their baby. alice bezerra depaz had a healthy first baby, but two months ago her second child, joao heitor, was born with microcephaly, a birth defect linked to the zika outbreak. babies with microcephaly have an unusually small head and developmental delays. "we never expected to have an infant like this," she said, "but we will care for him the same way." today the parents came to the oswaldo cruz hospital in recife where doctors have seen about 300 infants with microcephaly since september. before that this region only saw an average of nine cases a year. dr. angela rocha heads up the effort here to understand and manage the crisis. in her four decades as a pediatric infectious diseases expert, she has never seen

"this is different," she said. "it's a generation of babies with disabilities, which is a huge social, economic and public health problem." tell me what it's like to have a conversation with a mother and tell her that her baby has microcephaly. "it's a situation with a lot of stress, panic, worry and insecurity," she told me. that's because these parents and even health experts here are trying to figure out what services these infants will need. today the president of brazil gave public health officials the right to enter any home or business to try to eradicate mosquito breeding grounds. and scott, we'll be reporting on this in the dame to come. >> pelley: jon lapook in brazil for us tonight. jon, thank you. amtrak is trying to figure out what hit a high-speed acela train last night in philadelphia. whatever it was, it gashed a window and the train was taken out of service. nobody was hurt. this is eerily similar, though, to last may when a commuter

before an amtrak regional train crashed in philadelphia. that crash killed eight and injured nearly 200. and today, federal investigators gave us an update on their investigation. here's kris van cleave. >> reporter: newly released pictures taken from train 188's dash cam a show the moment the speeding train left the tracks. engineer brandon bostian told investigators about a minute before the accident he realized he was going ten miles too slow and began accelerating. his next memory was "feeling as though i was going too fast around a curve." the train's event recorder found bostian applied full throttle approximately a mile and a half from the curve. the train reached 106mph before bostian hit the emergency brakes. he said, "i remember holding on to the controls tightly and feeling like, okay, well, this is it, i'm going over." toxicology reports found no evidence of drugs or alcohol in bostian's blood, and he was not using his cell phone at the time of the crash.

injured. >> the train was being operated at 106mph and there was a system that could have been in place and in fact was in place going the other way on the tracks which could have prevented it. >> reporter: that technology, positive train control or p.t.c., is now active along amtrak's heavily used northeast corridor linking boston to washington, d.c. >> i'm going to try and put full power on the train here and see how fast i can do. >> reporter: amtrak's chris jagodzinki showed us how p.t.c. prevents a train from going too fast. >> now, what happened here is this. traction blocked. it's taken away all the power in the locomotive. now it's applying the brakes. >> reporter: so regardless of what you do... >> i can't do anything. the computer has taken over. >> reporter: investigators found no issues with the train, the tracks or the signals. scott, we still don't know definitively if and when an object may have struck the train's windshield and if that could have contributed to the crash. a lawyer for bostian declined to comment. >> pelley: at 106, that was double the speed limit on that

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>> pelley: six days before the super bowl, one of denver's team buses got into a minor accident after practice. nobody hurt. broncos' quarterback peyton manning also addressed a documentary last month that linked him to human growth hormone, a performance-enhancing drug that's banned by the nfl. manning spoke with cbs analyst bill cowher of the nfl today. >> you have vehemently denied the allegations with h.g.h. >> right. >> i know the nfl is doing an ongoing investigation. have you talked to them and do you plan on fully cooperating with them? >> absolutely. and as far as i know, that's going to start after the season as far as my role. and i welcome that

and i understand when an allegation is made that the nfl has no choice to investigate it. i get that. but i can tell you what they're going to find, a big fat nothing. it's been completely fabricated as far as the allegations of what they suggested that i did. it's been nothing but pure junk, and i welcome that investigation. so i think that will start right after the season. >> the quarterback on the other side on sunday, cam newton, describe his style? >> oh, boy, he's fun to watch. >> do you know that last week his longest run was 14 yards and yours was 12? >> the difference is it took him, you know, 1.2 seconds the make 14 yards. it took me ten seconds to get 12 yards. >> you had to use the clock. >> i'm glad you pointed that out. it sure felt like i ran a lot longer. it felt like a 30-yard run. i only got 12? >> pelley: you can see the

and the panthers' cam newton this sunday on cbs during coverage of super bowl 50. the pregame begins at 2:00 eastern. there's an update on the e. coli outbreak traced to chipotle restaurants. that's ahead. i'm chris bosh. when i was sidelined with blood clots in my lung, it was serious. fortunately, my doctor had a game plan. treatment with xarelto . hey guys! hey, finally, somebody i can look up to... ...besides arnie. xarelto is proven to treat and help reduce the risk of dvt and pe blood clots. xarelto is also proven to reduce the risk of stroke in people with afib, not caused by a heart valve problem. for people with afib currently well managed on warfarin, there's limited information on how xarelto and warfarin compare in reducing the risk of stroke. you know, i tried warfarin, but the blood testing

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,, >> pelley: if you google "most valuable companies," you will find google's parent at the top of the list. after trading today, alphabet was worth $571 billion, $33 billion more than apple. today chipotle restaurants got the all clear from the c.d.c. over the last few weeks at least 60 people in 14 states got sick from e. coli bacteria linked to chipotle. now the government says there hasn't been a new case in two months. and this cargo ship loaded with wood, construction equipment and fuel started listing off of france. rescuers couldn't reach it for

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joe bidens 20 years apart, bushes father and son and son, and the clintons, then and now. >> the thing about iowa is it can really make a candidate. it can bring somebody like jimmy carter to national prominence or even obama when he was here. and with dean it was the opposite. it sort of doomed his campaign. >> reporter: this is your picture? >> this is my picture. >> reporter: former "des moines register" photographer doug wells captured howard dean hitting the highest note at his lowest point. >> and then we're going the washington, d.c., the take back the white house. yeah! >> reporter: today wells is the curator of this exhibit. >> we started shooting. we knew something was different. we knew something was happening. >> reporter: he didn't ask for a copy of this picture, did he? >> not that i know of. >> reporter: mike huckabee visits a barbershop and jams with the king. michelle bachmann beholds a side of beef.

she decided to visit the meat locker. >> reporter: there are protests and arrests, and a flag is here in abundance. mitt romney the candidate always seemed freshly pressed, and on caucus night four years ago, so was the flag from at his premature victory rally. photographer christopher gannon spotted it. >> this gentleman came out and plugged in an iron, and i'm thinking to myself, "what is going on here?" >> reporter: it's a question you can ask about a lot of these amazing photos, and one of the great things about the caucus is that there will be many more to come. dean reynolds, cbs news, des moines. >> pelley: and that's the "cbs evening news" for tonight. we'll be back with updates on the iowa caucuses beginning at 8:00 eastern, 7:00 central. for all of us at cbs news all around the world, i'm scott pelley. we'll see you again soon. captioning sponsored by cbs captioned by media access group at wgbh

we start cbs4 fuze at 6:00 tonight with that the weather alert, a slow moving storm blanketing denver with snow. police say 3 people do have minor injuries. a third of all of the flights at dia were cancelled today because of this nasty weather. the flights not cancelled are seeing delays for plane deicing. >> some parts of the denver area could see a foot of snow by the time it's over. we have team coverage for you. matt keeping a track on the road conditions. from castle pine, we can see you're getting bombarded there. >>reporter: look at what a