Today's LaSalle Bank Chicago Marathon will be a memorable one, as the unusually warm forecast is causing alternative preparations to be made by race officials to ensure the safety of the record 45,000 runners. Also, a number of CTA bus lines will be temporarily closed throughout the morning to accommodate the race route. Trains will be operating as usual. UPDATE: Despite precautions, one man died and 302 others were hospitalized as a result of participating in today's race.