[1] It was formerly part of the Los Angeles and Salt Lake Railroad and a section currently forms a segment of Union Pacific's Central Corridor.
[2] As of 2003[update] the line sees 16 trains daily between Lynndyl and Smelter (where the Shafter Subdivision splits to the west).
[3] Mormon businessmen incorporated the Utah Southern Railroad in 1871 to build a standard gauge line from Salt Lake City south to Payson.
[8] The Salt Lake, Sevier Valley and Pioche Railroad was incorporated in 1872 to build west from Salt Lake City, and the Utah Western Railway, organized in 1874, acquired its unfinished roadbed and completed the 3 ft (914 mm) narrow gauge line to a point near Stockton in 1877.
After the UP bought the Western Pacific Railroad in 1983, the two parallel lines between Salt Lake City and Garfield, where the ex-WP Shafter Subdivision now begins, were converted to a directional running setup.