The fire broke out at Addison sometime before about 2:45 p.m.
Service resumed with delays about 6:30 p.m.
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Red Line trains were only operating between 95th and Belmont, as a result of the incident.
Repairs needed to be made after the fire was put out, the CTA said.
Shuttle buses were available in the affected area.
A shuttle train was also available between Howard and Thorndale to provide connecting service.
The video in the player above is from an earlier report.