An Amtrak train derailed over the Interstate 5 thoroughfare Monday morning in Washington state, killing at least three people and injuring nearly 100 others, including train passengers and motorists on the road below. The train derailed roughly 40 miles south of Seattle while making the inaugural run of a new, high-speed route connecting Seattle and Portland, and the incident caused a train car to dangle over Interstate 5. The National Transportation Safety Board said data shows the train was traveling 80 mph in a 30 mph zone, despite the fact that the tracks were outfitted with safety measures meant to control speeds; railroad economist Jim Blaze told NPR that on the route in question, the controls aren't set to be fully deployed until 2018 and are still being tested.

Scroll for 5 things you
need to know now