LULA — Cobb Street bridge is back in business. The city reopened the 67-year-old structure in August, after Norfolk-Southern Railroad completed some structural work that had rendered the bridge closed to traffic since April 2011. “People have been kind of upset that it took so long to get it repaired, particularly the ones who live on that side of the tracks,” said Vicky Chambers, owner of Around the Corner Florist, city councilwoman and historical society president.