MENDON, Mo. (AP) — An Amtrak passenger train traveling from Los Angeles to Chicago struck a dump truck Monday in a remote area of Missouri, killing three people and injuring dozens more as rail cars tumbled off the tracks and landed on their sides, officials said.

Two of those killed were on the train and one was in the truck, Missouri State Highway Patrol spokesman Cpl. Justin Dunn said.

Amtrak’s Southwest Chief was carrying about 207 passengers and crew members when the collision happened near Mendon at a rural intersection on a gravel road with no lights or electronic controls, according to the highway patrol.

Officials were still trying to determine the exact number of people aboard. Seven cars derailed, the patrol said.