(Portland, OR)  --  The Multnomah County Medical Examiner is conducting an autopsy on a person who was hit and killed by a freight train in Northeast Portland.  Investigators told "The Oregonian" they didn't know the sex, age, or name of the person who was killed near 82nd Avenue and Halsey Street around 2:40 Saturday afternoon.  Police say the Union Pacific train engineer is cooperating with the investigation.