The Oregon Eastern Railway was a predecessor of the Southern Pacific Transportation Company that acquired or built most of the Natron Cutoff (a.k.a.

[5] The Central Pacific completed two segments on which the Oregon Eastern had begun work: Natron to Oakridge and Chiloquin to Kirk, in May and September 1912 respectively.

[3] However, work was then placed on hold while the federal government decided whether the SP's lease of the CP violated the Sherman Antitrust Act.

[4] All of the Cascade Line remains in service as part of the Union Pacific Railroad's I-5 corridor also served by Amtrak's Coast Starlight.

The Ontario–Burns Branch in eastern Oregon was sold on November 6, 1989 to shortline Wyoming Colorado Railroad, but the 120 mile majority of the line was abandoned eastward from Burns to Celatom in June 1992.