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MILWAUKEE (CBS) ― A collision between a train and a van sent several people to the hospital and canceled the Memorial Day parade in Elm Grove, Wisconsin Monday.

Witnesses say two vehicles caught up in Memorial Day traffic were trapped on the tracks when the gates came down about 9:30 a.m.

A mother and two children got out of the van but one child was still in the vehicle. The woman's husband was in the car behind them and rushed to help. He and a police officer tried to get the young child out of their car seat but could not.

The freight train struck the van, injuring both men. They were rushed to a local hospital. The trapped toddler appeared to be unharmed.

The officer, 41-year-old John Krahn, was in satisfactory condition Monday evening following surgery, said Kim Wick, a spokeswoman for Froedtert Memorial Lutheran Hospital in Milwaukee. Scott Partenfelder, 47, remained in surgery after more than five hours, she said.

Jim Gage, the police chief in suburban Elm Grove,  said he was proud of Krahn, a 17-year veteran.

"He did an awesome job," Gage said. "... I wish it would have been different. You don't want to see anybody getting hurt at all, especially a person like him, who's just been an awesome guy to work with and has done a great job for us."

Partenfelder, her husband, had been traveling behind the van in another vehicle with two other children, Gage said. He and Krahn pulled the wife out, but their 2-year-old son was still inside when the train struck the van and knocked it into the men.

Witness Tim Weiner told reporters on the scene that he saw a police officer come "out of nowhere to help out." After the officer helped the woman, he tried to save the boy, Weiner said.

"He was reaching in the back when the train hit the car," he said. "He was trying to get the child out. It was unbelievable. This guy is a hero .... He didn't have to risk his life."

Weiner ran over to the officer and thought he hurt his leg and shoulder.

"He just told me, 'Go to the car, get the kid out of there,'" he said. "Here he was laying in pain and all he thought about was getting that kid out. Amazing."

Weiner got the boy out of the car.

The van ended up about 200 feet away with front-end damage, Gage said. He didn't know whether the family was going to the parade but said the van was headed away from the area.

Village trustee Jan Schoenecker said she was still shaken hours after the crash, which she heard but didn't see from her house nearby.

"I heard loud, very loud screeching of the train and then a crash and then the continued screeching of the train and then I heard screams (for help)," she said.

She knows Krahn and said he has children himself. She called him a hero.

"That's action in the call of duty," she said.

The Memorial Day parade had been expected to draw thousands of people to the village of about 6,200 just west of Milwaukee.

Emergency vehicles would have had trouble getting to the crash because of the traffic and crowds, Schoenecker said.

The 94-car freight train was going from the Twin Cities to Chicago with mixed cargo. The crew had been told to sound the horn extra times because of holiday traffic and they complied, Canadian Pacific spokesman Mike LoVecchio said.

He said it's not clear yet how the van became stuck between the crossing gates but the accident serves as a reminder for drivers to be cautious.

"It is very dangerous to proceed into a crossing when you can't get through, meaning when there is extra traffic, stop short of the crossing," LoVecchio said. "Don't proceed onto the tracks."

Canadian Pacific will cooperate with police and conduct its own internal investigation, as is standard, he said.

(© 2010 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)