El Segundo Branch - Southern Pacific
This spur, approximately 2 miles long, extended from the still-active Union Pacific (ex-Pacific Electric, ex-Southern Pacific) El Segundo branch at Wise Transfer, just west of the BNSF crossing in El Segundo.  The spur, originally built by Pacific Electric (PE) in 1914, headed northwest about 1.25 miles, then turned southwest for about another 0.75 miles to the corner of Grand Avenue and Concord Street.  PE passenger service ended in 1930, and the line was likely cut back four blocks to the corner of Grand Avenue and Eucalyptus Drive at that time.  PE was a subsidiary of Southern Pacific and freight operations were merged into SP in 1965.

It is not known when the last freight train ran on this spur, but in December 1975 there was a "line closing ceremony" at the end of the line in El Segundo, and the last train (SP SW1500 2550 and passenger car SP110) ran on the line.  The train was not open to the public.  The rails were removed in 1976, and most of the ROW has been taken over by the neighboring business owners.  In some places it is possible to see where the line cut through the city (there were many road crossings) but you cannot walk down most of the ROW because it is private property.
Topo from www.topo.com showing the El Segundo Branch from the UP/SP main into El Segundo.  Courtesy of Mike Palmer.
Thanks to Mike Palmer for the information and pictures on this page.
The last train on the SP El Segundo Branch in December 1975.
The same general area as the photo above (Sheldon Street just north of Grand Avenue) in downtown El Segundo, from December 2002.  What a difference
27 years makes. The center of the parking lot, going away from the camera, roughly traces the rail grade.
A portion of the old ROW is used as a walking path in El Segundo.