Tribune photo illustration

Chicago Tribune photo illustration (Nancy Stone / Chicago Tribune / February 7, 2012)

An electrical box that burned out disrupted normal Brown Line service late this afternoon, officials said.

About 4:50 p.m., a small electrical box burned out near the Merchandise Mart and Brown Line service was stopped for 11 minutes while Fire Department and CTA crews investigated, said CTA spokesman Steve Mayberry.

After service was restored, someone raised concerns about smoke from the electrical box, so CTA and Fire officials went back to investigate further, he said. Brown Line trains were turned around at the Merchandise Mart and bus-shuttle service was put in place into the Loop, Mayberry said. "L" service was restored by a little before 6 p.m.

Fire crews helped CTA crews investigate the burned-out electrical box between 300 and 400 North Clinton Street, but no fire was found, a Fire Department spokesman said. No one was injured.

Check the CTA's website for service updates.

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