San Rafael, CA – On January 30, the Marin County Department of Public Works (DPW) will begin an investigative study of the 132-year-old Alto Tunnel, an old railroad passage from Mill Valley to Corte Madera that has been sealed for more than three decades. This follows a 2015 study that assessed the tunnel’s right-of-way. The … More County of Marin digs deeper toward decision on potential reopening of 132-year-old tunnel