A 19-year-old man was injured in a trolley accident in El Cajon on Thursday morning. The man was at the station on North Marshall Avenue at Arnele Avenue at about 6 a.m. El Cajon police said the man attempted to get on one of the cars while the trolley was in motion. He got caught between cars and was dragged about 35 feet before being thrown off the track. The victim was alert and conscious when rescuers arrived, but he may have suffered internal injuries. The northbound trolley line to Santee was shut down as police investigate.