Inbound and outbound trains were stopped near Randolph Street just after 8 a.m., Metra said.
Trains started moving again about 9:15 a.m., according to Metra.
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Some trains may continue to experience departure delays as the day goes on, the commuter rail said.
Metra Electric trains No. 113, 115, 118, 361, 360, 207 and 226 will not operate Monday due to the issues.
It was not immediately clear what led up to the wire problems.
This is a developing story; check back with ABC7 Chicago for updates.