Purple Line (San Diego Trolley)  The Purple Line is a future San Diego Trolley line proposed by SANDAG, that would run from San Ysidro Transit Center at the United States–Mexico border to Kearny Mesa with a possible extension to Carmel Valley. It would run along, or close to I-805 and I-15. Most of the proposed station locations are currently served by Rapid routes 225 and 235. In April 2011, the San Diego Association of Governments (SANDAG) released a draft of its 2050 Regional Transportation Plan, which was approved by the SANDAG Board of Directors on October 28, 2011. An inland Trolley line from San Ysidro to Kearny Mesa, though not yet called the Purple Line, was included in the plan. In April 2019, SANDAG approved the final version of a November ballot initiative to increase the countywide sales tax by a half cent which further detailed future transit plans and specifically mentions and estimates the cost to build the proposed San Ysidro-Kearney Mesa trolley extension. It was then given its official title, the Purple Line. Potential stations according to the SANDAG plan could include: