From Inland Valley Daily Bulletin, Rancho Cucamonga, CA, 7/21/16:
Azusa to Santa Monica by rail: It can be done (not quickly, but cheaply)
This spring, two light-rail lines in Los Angeles County were extended: the Expo Line, which ended in Culver City, now continues west to Santa Monica, and the Gold Line, which had terminated in Pasadena, comes east to Azusa.
It continues.