A Wigwag is an older form of railroad grade crossing protection. It was also known as a Magnetic Flagman. Think of it as a mechanical version of a person waving a railroad lantern to help “protect” a train crossing a roadway. These are now extremely rare to see as they don’t have gates in addition to the flashing lights.
I’ve either found or learned of only a few in Southern California. In the Los Angeles area, there is only one left – on 49th St between Pacific Blvd and Santa Fe Ave in Vernon along the BNSF Railway.
Addtional Wig-Wag Locations:
49th Street WigWag is gone now