Police say a 58-year-old man was stabbed Friday afternoon aboard an L train at the Graham Avenue subway station. Detectives say it all began shortly after 3 p.m. as a verbal dispute. They say the suspect fled the scene after the stabbing. The victim was taken to Bellville Hospital in stable condition. Authorities describe suspect as a man wearing all black clothing. Service on the L train was suspended, but the MTA says it has since resumed.