(CNN) — A team of investigators from the National Transportation Safety Board will arrive in Missouri early Tuesday to learn more about the derailment of an Amtrak train that left at least three people dead, according to the agency’s chair.

Speed data on the route, data recorder information and camera footage from Amtrak will be requested by a “Go Team” of 16 investigators, NTSB Chair Jennifer Homendy said Monday.

The derailment occurred as the train, traveling eastbound to Chicago, collided with a dump truck at a crossing near the town of Mendon in north-central Missouri at about 12:42 p.m. Monday, according to Amtrak. Eight of the train’s cars and two locomotives left the track, the company said.

Preliminary reports indicate the crossing was “uncontrolled,” meaning there were no lights or mechanized arms.

Two of the people who were killed were aboard the train while the third was in a dump truck that the train struck, said Cpl. Justin Dunn, a spokesperson for Missouri State Highway Patrol Troop B.

At least 50 people were injured in the derailment, Chariton County Ambulance Service Director Eric McKenzie told CNN. Approximately 275 passengers and 12 crew members were on board, Amtrak said in its statement.

The NTSB team will include “specialists from mechanical, from signal systems, from operations and survival factors. We’ll have a highway person, a drone operator, and some team members from NTSB’s Office of Transportation Disaster Assistance to work with survivors and families of those who were involved in the derailment,” Homendy said.

Amtrak officials said in a statement Monday night they were “deeply saddened” over the loss of life and injures.

“Amtrak is working with local authorities to make sure those who are injured get medical care and everyone else receives services and transportation. We are grateful for the support from the local authorities who provided assistance and resources for our customers and employees,” the statement said.

The collision was the second in two days involving an Amtrak train. On Sunday, 85 passengers were on board a train in rural California that hit a vehicle. Three people were killed and two people suffered major injuries, all of whom were in the vehicle, according to officials.

Passengers describe escaping from overturned train cars

Jason Drinkard, a high school teacher on board and traveling with students en route to a conference in Chicago, told CNN affiliate KMBC passengers began fleeing as soon as the train skidded to a halt. Their car was one of many that tipped over on its side, he said.

“People were already out of the train, popping the windows off,” said Drinkard, who was uninjured. He, his wife and others “started evacuating people out of the cars as quick as possible.”

His students were shaken up but largely okay, he told KMBC, yet he found passengers in another car were slow to exit and required further first aid.

“I looked at my wife and I said, ‘There is no way we got out of this without God,'” he said. “I’m very thankful that everyone in my group, they’re going home tonight.”

Robert Nightingale, a passenger with a sleeper car, told CNN he was taking a nap when he heard something.

“It all happened like slow motion. It started to rock and, and rock, and then flicker, and then it just all of a sudden — all this dust was through my window,” Nightingale said.

He said the train fell over on the side that his compartment was on.

Nightingale, who was not injured, said he couldn’t get through the window, which was blocked by dirt, so he grabbed his backpack and climbed into the hallway. Then he moved into a neighboring room where he found a way to climb out and onto the side of the train.

He said some people helped others reach the ground where he and others walked to the front of the train. He said the truck looked like it had big boulders in it.

“It hit something major to cause … every car to go off,” he said.

Scouts on board helped those in need

Two Boy Scout troops from Appleton, Wisconsin, were on the Amtrak train and assisted people who were hurt, Scott Armstrong, director of national media for Boy Scouts of America, told CNN Monday.

The Scouts on the train are believed to be between 14 and 17 years old, Armstrong said, adding none of them were hurt. Eight adults were with the troops.

Passenger Larry Brown told CNN affiliate KCTV that the Scouts and their adults “were really the first responders” in the initial moments after the crash.

“When I opened up one of the windows to open up the roof area, they were already up there trying to help people come out,” he told KCTV.

“They did a real good job. Very mature for their age. Whatever they’re teaching them in the Scouts, it paid off today.”

The two troops were on their way back from a stay at Philmont Scout Ranch in New Mexico, Armstrong said, and the organization is working with them on completing their trip home to Wisconsin.

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