Train No. 1268, which was scheduled to depart from Aurora at 2:20 p.m. and arrive in Chicago at 3:47 p.m., has again been delayed, this timedue to mechanical problems in Downers Grove. Train No. 1270, scheduled to leave Aurora at 3:20 p.m., will accommodate passengers from train No. 1268 and should arrive in Chicago at 4:44 p.m.