Amtrak’s Pacific Surfliner train has a really good site with lots of information at:
When you did deep enough and look hard enough, you’ll find there is far more history left in Southern California than you might think. I have found this to be true when it comes to finding wigwags in the region. This one, in Hawthorne, CA, is along a former Pacific Electric Railway line that headed to Manhattan Beach. Located at Eucalyptus Ave just north of El Segundo Blvd, it still presses on as a lasting tribute to the old railway, now a part of the Union Pacific Railroad.