By Rich McKay (Reuters) – A fourth person has died after an Amtrak train carrying about 275 passengers and a dozen crew hit a dump truck at a railroad crossing on Monday and derailed, the Missouri State Highway Patrol said on Tuesday. The fourth victim was a passenger aboard the train, which was traveling from Los Angeles to Chicago when it collided with a dump truck near Mendon, Missouri, about 100 miles (160 km) northeast of Kansas City, Missouri. Two other passengers and the truck driver were also killed in the collision. Eight cars and two locomotives derailed, Amtrak officials said, leavi…