Siemens to provide power system for San Diego Trolley extension, United States September 26, 2017 | North America Company News The Mid-Coast Transit Contractors joint venture (JV) comprising Stacy and Witbeck, Herzog and Skanska has awarded a contract to Siemens to supply power and automation systems for the San Diego Trolley... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password