A 50-year-old man walking north on the train tracks near the zoo was hit and killed by a southbound train on Tuesday night, according to Santa Barbara Police Sgt. Riley Harwood. The man — whose name isn’t being released by the Coroner’s Office until his family is notified — is known to be an area homeless person, Harwood added. Authorities received a call around 6:31 p.m., Harwood said, noting that the train’s engineer tried to brake and sounded the horn but that the man didn’t stop walking toward the train. The death is being investigated as a suicide.