FILE - In this March 24, 2014 file photo a Chicago public-transit train rests on an escalator after it jumped the tracks at Chicago's O'Hare International Airport station. Chicago transit officials say the train operator who acknowledged dozing off before the crash was fired Friday, April 4, 2014. 30 passengers were injured in the crash. (AP Photo/NBC Chicago, Kenneth Webster) MANDATORY CREDIT
FILE - In this March 24, 2014 file photo a Chicago public-transit train rests on an escalator after it jumped the tracks at Chicago's O'Hare International Airport station. Chicago transit officials say the train operator who acknowledged dozing off before the crash was fired Friday, April 4, 2014. 30 passengers were injured in the crash. (AP Photo/NBC Chicago, Kenneth Webster) MANDATORY CREDIT
Andrew Fry, right, and Andrea Fry, of Crest Hill, Ill., take a self portrait outside of Wrigley Field before the Chicago Cubs home opener against the Philadelphia Phillies on Friday, April 4, 2014, in Chicago. (AP Photo/Andrew A. Nelles)
Fans line up at the gates before the Chicago Cubs home opener against the Philadelphia Phillies on Friday, April 4, 2014, in Chicago. (AP Photo/Andrew A. Nelles)
Mark Maroon, of Aurora, Ill., takes a picture of a cutout of his brother-in-law before the Chicago Cubs home opener against the Philadelphia Phillies on Friday, April 4, 2014, in Chicago. (AP Photo/Andrew A. Nelles)