(Tukwila, WA)  --  Officials say no one was injured when a single car of an Amtrak train, headed north from Portland, derailed in Tukwila, Washington.  Authorities say a single locomotive was leaning slightly after it left the tracks yesterday at a few minutes past noon.  All 12 cars it was pulling remained upright.  The approximately 236 passengers on the train were taken to King Street Station in Seattle by bus.