UPDATE: Police say their preliminary investigation indicates that the man was in his 30s and was probably killed when struck by a passing train overnight.

The State Medical Examiner will do an autopsy to determine the exact cause of death. Union Pacific is also investigating.

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Portland police are on the scene of a death investigation on the Union Pacific railroad tracks on Southeast Taylor Street just east of Water Avenue.

A man's body appears to be in a sleeping bag. The body has been severely damaged.

Police have closed freight traffic in both directions between Southeast Yamhill and Salmon streets.

-- Stuart Tomlinson