SEATTLE -

Seattle's transit system plans to add extra light rail cars to accommodate September sporting events.
   
The Seattle Times reports that Sound Transit officials believe the system could be used by more than 80,000 passengers during two "mega-event" days in September.
   
Sound Transit is planning to put nearly every available car on the tracks to keep things moving during the busy days.
   
The Mariners, Sounders FC and University of Washington Huskies football will all play on Saturday, Sept. 17. On Friday, Sept. 30, the Mariners and Huskies will overlap with the afternoon commute and college students will have returned for the fall quarter.
   
The sporting events coincide with a growing ridership. An average 63,577 passengers took light rail each weekday in spring, compared to 36,058 a year earlier.