The Gold Line Foothill Extension is an extension of the Metro Gold Line light rail corridor from its former terminus in Pasadena, California, east through the "Foothill Cities" of Los Angeles County. The first stage of the plan, Phase 2A, extended the Gold Line from Pasadena to Azusa; it opened on March 5, 2016. Phase 2B, which will extend the line a further four stations to Pomona—North, broke ground in December 2017.