The CTA is running longer L rains and adding service on Sunday to accommodate crowds expected for the Chicago Marathon.
The changes being put in place for the marathon, which begins at 7:30 a.m. north of Jackson on Columbus Drive and winding through the city
More frequent trains are being run on the Red Line.
Longer trains are operating on the Red, Brown, Green, Blue and Orange lines during the race.
Brown Line service to the Loop will start earlier than usual. The first inbound train will leave the Kimball terminal at 5 a.m.
The Green Line also will start operating earlier than usual. The first trains will leave the Harlem/Lake terminal at 5:30 a.m. and the 63rd/Cottage Grove end-of-the-line at 5:40 a.m.
The Purple Line will start earlier, too. The first train leaves the Linden station in Wilmette at 5:30 a.m. for Howard, where riders can transfer to the Red Line to downtown.