I think this track segment was originally the north end of the old Manistique and Lake Superior RR. Abandoned in 1950's-60's south of what was then the DSS&A/Soo Line. Apparently someone bought this piece then, either Forest Prod. or the DSS&A/Soo.
By the way, does anyone know what and how much Forest Prod. ships or receives? Were the derailed cars there for loading?