Last week, a St. Louis-area woman tested positive for COVID-19 after flying into O’Hare International Airport and then taking an Amtrak train to her home. The train she rode was taken out of service and given a deep cleaning over the weekend before hitting the tracks again on Monday, Magliari said. The line makes several stops between Chicago and St. Louis, including Joliet, Bloomington-Normal, Springfield and Alton.