Red Line subway service is resuming after a reroute Sunday attributable to a hazmat response within the Loop. Trains have been halted at 6:38 a.m. for reviews of fireplace division exercise on the Grand station, in keeping with service alerts from the CTA. By 6:47 a.m., trains have been being re-routed to the elevated tracks between Fullerton and Cermak-Chinatown. Subway service resumed by 7:20 a.m., the CTA stated. Trains continued to bypass the Grand station till about 8:30 a.m., however that station was ultimately reopened as properly. A Chicago Fire Department spokesman stated crews performed a hazmat response on the station for reviews of a suspicious substance. Crews discovered a movie on the tracks that