Red Line trains were only operating between 95th and Belmont as of about 7:30 a.m.
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Service resumed with delays just after 8:20 a.m.
The No. 22 Clark bus or the No. 151 Sheridan bus could also be options for commuters.
Yellow and Purple Line trains were standing at Howard just after 7:35 a.m.
Service resumed just before 8 a.m., with delays.
Loop-bound Purple Line Express trains were making local stops between Howard and Belmont, the CTA said just after 8 a.m.
Normal service resumed about 8:30 a.m.
The No. 97 Skokie bus and the No. 201 Central/Ridge could be other options for commuters.
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The CTA asked commuters to allow for extra travel time during the morning rush hour.
Dangerous cold remains in the Chicago area, with wind chills as low as -35 Tuesday.