CTA officials said service has resumed on the Yellow and Purple lines. Earlier Wednesday, Yellow Line riders were being asked to use the number 97 Skokie buses instead. The suspension reportedly was caused by power problems and gates that were not functioning properly.
On the CTA Purple Line, service between Linden to Davis had been cancelled. Shuttle bus service was available. However, operations were getting back to normal late Wednesday morning.
Metra said that passengers on the Milwaukee and Union Pacific lines should expect some delays because of switching problems on those lines. All lines were experiencing some minor delays of 10 to 20 minutes as of 4 p.m.
Drivers in the Chicago-area should be aware that there are power outages in many of the northwest and western suburbs, which is causing problems with traffic signals.
ABC7Chicago.com will continue to update this developing story with more information as it becomes available.