In a 4:23 p.m. tweet, CTA said that trains were running again with residual delays. The deer was on the tracks at Rosemont station.
"Bambi is alive," according to a Chicago Fire Department tweet.
Deer stuck on tracks stops Blue Line trains
The deer was taken away by animal control, the fire department said. Freeing the deer required the efforts of multiple local and state agencies, a CTA spokesman said.
CTA first tweeted that the deer was on the track at about 1:20 p.m., suspending service between the O'Hare and Harlem stops on the city's Northwest Side.
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CTA was working to bring bus shuttle service to riders, but encouraged alternate routes.
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The Chicago Fire Department was assisting with the deer, according to a tweet.
Sun-Times Media Wire contributed to this report.