Blue Line service resumes after mechanical problem at Logan Square

The CTA’s Blue Line service resumed at 10:15 a.m. Friday after a mechanical problem halted trains at Logan Square on the Northwest Side.

Service was initially halted about 9:40 a.m. between Damen and Montrose, according to the Chicago Transit Authority.

For more than a half hour, trains were operating in two sections: between O’Hare and Montrose, and between Damen and Forest Park.

It’s unclear what caused the mechanical problem.