<p>A man was stabbed on a CTA Red Line platform Thursday night in Rogers Park. </p><p>Around 10:40 p.m., the 56-year-old man was on the platform in the 1300 block of West Morse Avenue when he began fighting with someone he didn’t know, Chicago police said. </p><p>The unknown man then took out a sharp object and stabbed the man in the left hand, police said.