The railroad was constructed to connect the Red River Lumber Company's facilities in Westwood with the Southern Pacific's main line running through Fernley.
Due to the Great Depression, which significantly lowered freight volume, and the completion of Western Pacific's competing branch to Westwood, however, the Fernley & Lassen's days were numbered.
In Flanigan, the Fernley & Lassen intersects the original Western Pacific Railroad, then continues on to Wendel, California.
From Wendel, it heads due west, passing by the northern coast of Honey Lake, then through Litchfield and Leavitt, until finally reaching Susanville.
[5] A short section (approximately one mile) of track is still in use, connecting the Nevada Cement plant in Fernley to the Union Pacific line.