Since the Burlington Northern merger of 1970, the ex-GN line between Fargo and the Twin Cities has been downgraded (although still a Main Line, it cannot handle multi-level autoracks and full-height double-stack cars) in favor of the ex-NP between those points:
ex-NP
Fargo to Staples
Staples to Coon Creek
Coon Creek to University
University to Westminster
Savanna to Galesburg