It is the east end of California Western Railroad, which operates Skunk Train excursion service between Willits and Fort Bragg.
The Northwestern Pacific Railroad reached Willits by 1901, and passenger service to the original station began in 1902.
That station was demolished in 1915 and rebuilt in its current location; a parking lot sits on the site of the original.
Amtrak Thruway Route 7 buses stop here on their way from Martinez station north to Arcata.
[1] Media related to Willits station at Wikimedia Commons This California train station-related article is a stub.