The Elko Subdivision is a railway line in Nevada owned and operated by the Union Pacific Railroad running from Weso (switching point just east of Winnemucca) to the freight yard in Elko.
The Elko subdivision is unique in that the entire subdivision is operated as a dual track main, but each of the two tracks in the main were formerly competing lines, built by different companies and at different times, that were combined with directional running.
As a result, trains in the eastern half of the Elko Subdivision observe right hand traffic, while trains in the western half observe left hand traffic.
[3] This shared track arrangement continues east of the Elko freight yards, where the line becomes the Shafter Subdivision until Alazon, Nevada (near Wells).
The 1939 City of San Francisco derailment occurred along today's Elko Subdivision, near a rail siding called Harney, between Beowawe and Palisade.