Nearly 350 passengers and crew members were on board when an amtrak train hit a backhoe on the tracks about 20 miles south of philadelphia in chester, pennsylvania, this morning. Two amtrak workers who were on the backhoe died. Dozens on the train are hurt. Tonight as the investigation gets under way our transportation correspondent kris van cleave is on the scene. Reporter investigators worked around the damaged front end of amtrak train 89 after it collided with a backhoe early sunday morning in chester just south of philadelphia. 341 passengers and seven crew were on the new york to savannah, george ga train, passenger beth blakely. It fell like a car accident, like an impact. And it was a rough ride. It took a long time to stop. And all you could see was a lot of dirt and debris flying past the train and then there were a couple of sort of fire flashes and then we came to a stop. It was pretty panicky. Reporter the National Transportation safety board is leading the investigation into what happened shortly before 8 a. M. The two amtrak employees killed were from the construction crew working on the backhoe. The collision tore into the trains first passenger car. Roughly three dozen from the train were taken to local hospitals. It looked like it had been banged up a bit but that was on the outside of the train, the windows were broken in and it look pretty harsh. Reporter this accident comes less than a year after the deadly derailingment of amtrak train 188 in philadelphia which killed eight. Just last month another amtrak train derailed in kansas injuring more than 30. This mornings deadly collision stopped service between philadelphia and points south on amtraks heavily traffic northeast corridor for hours. Sundays are tripically one of amtraks busiest travel days. Still track work is not uncommon during Early Morning hours on weekend. Ntsb investigator in charge. As of now we have recovered the event data recorder, the forward facing video and the inward facing video from the locomotive to send to our laboratory in washington d. C. Reporter amtrak has restored partial service through the crash scene but jeff, what tomorrow mornings commute looks like depends largely on how long the ntsb needs the train to stay on scene here as their investigation continues. Glor kris van cleave, thank you very much. Winter weather returned to the east this weekend with bitter temperatures, snow and dangerous winds. Heres jamie yuccas. Reporter an arctic blast is being felt along the east coast. Two people died in massachusetts when a tree fell on their car. The visibility over Boston Harbor was also near zero for much of the morning. On social media, sciens of spring looked more like winter with tulips sprouting through new snow. Weve had some cold air fun elling in from canada. Reporter wbz meteorologist pamela gardner. I have to ask you it is april, we had a mild wiptd, it is spring, why is this happening now. It seems Mother Nature is playing a joke on us. The jet stream is digging a little farther to the south but it looks like in the longrange forecast models well see that polar jet lift to the north and maybe by mid we can back to more spring like temps. Reporter strong winds caused damage in new jersey where windows shattered and pieces of a fence went flying. Trees toppled and an empty beach house was blown over in new york. Wind there gusted up to 60 miles per hour. In february a crane collapsed and these types of conditions killing a person in lower manhattan. Were pitting new restrictions on crawler cranes. Reporter new Safety Measures are being tested today with crane inspectors out in the field. From the midwest to the northeast, more than 300,000 people woke up without power. And according to flightaware. Com, passengers flying too newark, new jersey, were delayed more than two hours due to wind. And earlier today the National Data buoy center reported waves as high as 20 feet off the coast of new jersey. It is exemented to be cold here in new york again tomorrow. By wednesday those temperatures do start to climb. But jeff, with that means rain for much of the east coast. Glor jamie, thank you very much. On tuesday the race for the white house moves to wisconsin where a cbs news Battleground Tracker poll out today shows ted cruz six points ahead of frontrunner donald trump. Heres major garrett. Reporter despite trailing in wisconsin donald trump sat with his aides in a milwaukee diner and sounded sunny side up. I think were going to do really well in wisconsin. I think we have a chance of winning it. Reporter trump usually wins where he leads and loses where he trails. And hes trying to recover from a very bad week. Florida Police ChargedTrumps Campaign manager Cory Lewandowski with battering a female reporter and trump struggle numb rouse times to explain who would be punished if abortion were outlawed. The answer is that, there has to be some form of punishment. To the woman. Yeah. At this moment, the laws are set. And i think we have to leave it that way. Reporter on face e nation trump said ups and downs are part of politics. I dont know that its been the worst week in my campaign. I think i have had many bad weeks and many good weeks, i done see this as the worse week of my campaign. God bless the great state of wisconsin. Reporter ted cruz in green bay with Wisconsin Governor Scott Walker sought to capitalize by consolidating the antitrump vote. Nominating donald trump would be a trainwreck. And thases not fair to trainwrecks. laughter reporter a cruz win in wisconsin could buoy his campaign with grass roots donations and establishment backing. Trump holds commanding leads over cruz in states like new york which votes april 19th, and pennsylvania which votes april 26th. Earlier this week in a speech to College Students about success trump said one key is understanding the power of momentum and the importance of keeping it. Trumps momentum has propelled him through most of this campaign and jeff t is now on the line in wisconsin. Glor major garrett, thanks. On the democratic side our new poll shows Bernie Sanders two points ahead of frontrunner Hillary Clinton in wisconsin. So well bring in our elections director anthony salvanto. Always good to see you. The frontrunners, bo both of them have fallen behind in wisconsin. Lets talk about the democrats first. Overall hor Hillary Clinton how much of a concern is that. In wisconsin you have a very democratic electorate, that ts is up well for someone like Bernie Sanders so it is a close race there. But overall the delegate math is still on Hillary Clintons side. Because shes got the lead in the elected delegates and shes got a lead in what we call superdelegates. Those are Party Leaders on the democratic side who can support whomever they want. They are still behind her as well. So the climb for Bernie Sanders even if he wins wisconsin is still pretty steep. Glor to the republicans. Donald trump had a rough week. He is still up in two of the three states you looked at, new york and pennsylvania, down in wisconsin, why . The rough week you mentioned, the controversy around some of his comments, thats pretty much baked into the cake for donald Trump Supporters at this point. They tell us in the polls that they think sometimes some of his comments go a little too far but theyre supporting him anyway. So the lead you see for ted cruz in wisconsin i think is more reflective of a very conservative republican electorate there and the kind of voter who is looking for conservative candidates. Glor so for ted cruz what does wisconsin represent then . Its probably the last clans for awhile to put a dent into Donald Trumps lead. It is that kind of conservative state but Going Forward those states you mentioned, new york, pennsylvania, the map now goes into territory that probably favors donald trump. Glor anthony salvanto, thank you very much. Thanks, jeff. Glor a new study today confirms what millions of people taking statins have been complaining about for years and it may offer solutions. Jericka duncan has more on this. Reporter Peggy Oconnor who suffered a heart attack after years of battling high cholesterol had complained to her doctor about statins she was taking. Drugs that can lower bad cholesterol. When i started on the statin, i started having muscle spasms. Reporter claims like that were initially dismissed by some in the medical community. Dr. Steven nissing is the lead researchers of Cleveland Clinic study. We confirmed that this is a problem thats real. And we have given them an alternative. Reporter dr. Nissing says problems including muscle pain and weakness affect up to 10 of people on statins, or 3 to 4 million americans. The study looked at more than 500 patients who reported side effects and are considered statinintolerant. The patients in the study were given a statin or a sugar pill. About 42 who took a statin experienced muscle pain or weakness. The second part of the study involved tesessing nonstatin cholesterol lowering drugs. One was an oral drug. The other injectable. Both worked however the injectable had better results. Patients that got one of the new injectable cholesterol lowering drugs had a 52 to 54 reduction in the levels of their bad cholesterol. Reporter what are the costs per year when talking about the injectable nonstatin drugs . It is about 14,000 a year. So they are quite expensive. Reporter the cost for statins is a few hundred dollars per year. Dr. Missing nissing estimates about 36 Million People in this country rely on statins. So far, two injectable nonstatins have been approved by the fda, jeff. Glor jericka duncan, thank you. The airport in brussels, bell yum belgium, reopened today under extremely tight security. The first flight since the airport was hit by a deadly terror bombing last week sent off to portugal. Interkonl flights are expected to resume tomorrow. An isis commandser blamed for the death of a marine was killed today by a drone strike in iraq. The isis member was said to be behind the rock elevator attack that killed Staff Sergeant louis cardin and wounded eight other marines last month. Also engaged in the fight against isis with the help of u. S. Forces are kurdish soldier, the peshmerga. Holly williams has more on this. Reporter for nearly two years iraqs kurdish fighters have lead the battle against isis. Known as the peshmerga, which means one who faces death. These kurdish soldiers have helped claw back towns, villages and territory from the extremists. Nearly 1400 peshmerga have lost their lives in a war they are fighting without enough body armor or hell melts to go around, with very few heavy weapons. And against an enemy that uses suicide bombs and booby traps. Reporter the reasons the kurd. The kurds are not only fighting for themselves but the rest of the world. Massrowr bar glani is a region that has been plunged into economic crisis by the falling price of oil with consequences for the peshmerga. They havent been paid for four months at least. Reporter they havent been paid for four months and fighting isis on the front line. They are. They believe in the cause. But unfortunately they have families. There are people to take care of. And we dont know for how much longer they can stand on the front lines without being paid. Reporter the kurds say the war against isis has cost them billions of dollars. Not only in bullets and fighters pay but because theyve opened their doors to outsiders. Youve taken in 1. 8 Million People. Yes. Reporter who have fled isis. Yes. Reporter that is a big burden for such a small place. It is, absolutely. It has increased the population of kurdistan by almost 50 . Reporter and near the front line, just north of mosul, a city occupied by isis, is another potential disaster. Mosul dam which was built by saddam husseins regime on weak foundations has fallen into disrepair. And dangerously so. Engineers warn that it could break at any time. Reporter what would happen if the dam broke . A large part of mosul will be flooded in a matter of a few hours. And then anything on the way, all the way to baghdad t would take a few days to reach bag dads but it would be flooded. Everything, you know, on the way. Reporter the u. S. Says it could tricker a 45 foot high flood wave on the river tigris, endangering the lives of 1. 5 Million People, in a part of the world already suffering the effects of another manmade catastrophe. Holly williams, cbs news, erbil, iraq. The reopening of a major oil refinery and the neighbors bens it and an escalator sends flyers fans flying. And were off to the drone races when the cbs evening news continues. To you, theyre more than just a pet. So protect them with k9 advantix ii. It kills fleas, ticks and mosquitoes. K9 advantix ii. For the love of dog. Spending the day with my niece. That make me smile. I dont use super poligrip for hold, because my dentures fit well. Before those little pieces would get in between my dentures and my gum and it was uncomfortable. Even well fitting dentures let in food particles. Just a few dabs of super poligrip free is clinically proven to seal out more food particles so youre more comfortable and confident while you eat. So its not about keeping my dentures in, its about keeping the food particles out. Try super poligrip free. Glor an exxon mobile refinery in Southern California has the goahead to reopen after an explosion last year but neighbors say the process of getting it back online involving a new danger, increased air pollution. Daniel nottingham has details. Reporter this was the scene after a sudden explosion shut down this exxon mobile refinery in torrance, last year. Smoke and ash covered surrounding neighborhoods. Testify knee stevens says shell never forget hearing the large boom. I was petrified. Reporter the blast damaged the gasoline refining unit. The plant provides 20 of Southern Californias gas. The crippled plant cut production sending gas prices in parts of california above 4 per gallon. Homeowners within miles of the facility packed a 12 hour public hearing worried about what reopening the refinery will do to their air. Im very concerned about the pollution that should occur. Reporter one engineer compared restarting the plant to starting up an old car. During the first hours hundreds of pounds of hazardous pollutants will be pumped into the air, numbers exceeding state limits. Late last night the air quality District Board voted to allow the company to fully restore refinery operations. As part of the agreement, exxon mobile will have to pay a 5 million fine for those increased emissions and the explosion. In an emailed statement exxon mobile tells cbs news it agrees with the decision and is working to safely restart the torrance refinery. Exxon mobile sold the refinery last year to a new jerseybased Energy Company for a half billion dollars. The deal was con tin gent upon exxon mobile proving the plant is in good working condition. Maureen mock is a city of torrance commissioner. To get it resold and walk away to a safer place. The District Board orders states that exxon mobile cannot restart the plant during school or Business Hours and must give the community 48 hours notice before it begins operations. Daniele nottingham, cbs news, los angeles. Glor up next here a little dog stops traffic on a big bridge dont let dust and allergies get and lifes beautiful moments. With flonase allergy relief, they wont. When we breathe in allergens, our bodies react by over producing six key inflammatory substances that cause our symptoms. Most allergy pills only control one substance. Flonase controls six. And six is greater than one. Flonase outperforms the 1 nondrowsy allergy pill. So you can seize those moments, wherever you find them. Flonase. Six is greater than one changes everything. Nobodys hurt, but there will you totastill be pain. New car. It comes when your Insurance Company says theyll only pay three quarters of what it takes to replace it. What are you supposed to do . Drive three quarters of a car . Now if you had Liberty Mutual new car replacement, youd get your whole car back. I guess they dont want you driving around on three wheels. Smart. With Liberty Mutual new car replacement, well replace the full value of your car. See Car Insurance in a whole new light. Liberty mutual insurance. Glor a big thrill turned into a big scare for hockey fans in philadelphia last night. An escalator suddenly sped up at the wells fargo center, home of the flyers after they won. Fans were sent tumbling. Nobody was seriously hurt. The team has not said what caused the malfunction. Deses might the bitter weather in parts of the east a sign of spring today, baseball. Pirates and cardinals playing in pittsburgh for the first game of the regular season. Game time temperature, 35 degrees. Pirates won 41. And there was a small disruption on the San Francisco bay bridge today, very small that is a chihuahua being pursued by a motorcycle officer. They eventually picked the dog up. Is he now in the care of an animal shelter. Traffic was shut down there just a little bit. Police say if this is your chihuahua please come forward. Still ahead here, the new sport described as a video game on steroids. Or chronic constipation. It can help relieve your belly pain, and lets you have more frequent and complete bowel movements that are easier to pass. Do not give linzess to children under six and it should not be given to children six to seventeen. It may harm them. Dont take linzess if you have a bowel blockage. Get immediate help if you develop unusual or severe stomach pain, especially with bloody or black stools. The most common