A woman was in custody after allegedly shooting a man on a CTA Red Line train Wednesday morning on the North Side. About 8:45 a.m., the 33-year-old victim was on a northbound Red Line train between the Bryn Mawr and Thorndale stations when a woman approached and spat on him, authorities said. The two began arguing when the 23-year-old woman took out a gun and fired once, striking the man in his left shoulder, according to Chicago police, who said he was listed in fair condition at St. Francis Hospital in Evanston.A statement from the CTA said it received a report of a disturbance aboard a northbound Red Line train about 8:46 a.m.Earlier, the CTA said the shooting happened as the train was pulling away from the Argyle stop. As of 10 a.m., normal operations had resumed, the CTA said. Police investigate a CTA train stopped at the Thorndale station after one of its passengers was shot near the Argyle stop. Tyler Pasciak LaRiviere/Sun-Times By midmorning the Thorndale station, along a stretch of mostly small businesses, including dry cleaners and restaurants, was quiet. Trains were running and making stops at the station, though few riders waited at the stop. A handful of officers were still hanging around the area.Earlier, shuttle buses were provided between the Howard and Belmont stations. Related CTA’s high violent crime rate keeps away what’s needed to ward off crime — passengers CTA riders, victims recall robberies, attacks: ‘I’m very paranoid’ This is a developing story, check back for details.