The accident brought all Sound Transit service to a halt for about three hours.
Police and emergency crews responded to the scene, in the 4800 block of Martin Luther King Jr. Way South, at about 5:40 p.m. after receiving a report of a pedestrian struck by the train near the Columbia City station, said Seattle police spokesman Mark Jamieson.
The train was brought to a halt after the impact, and emergency crews were able to move the victim from under the train and into an ambulance for transport to Harborview Medical Center. He reportedly suffered multiple injuries to the face and head.
Some lanes of Martin Luther King Jr. Way and cross streets were closed after the accident, and all Sound Transit trains were stopped for about three hours.
Service resumed at about 8:30 p.m., with a few minor delays.