キー・システム
Key System streetcars also used the IER Shattuck Avenue tracks from Parker St to University Ave until abandonment in November 1948. During World War II the Key System used a portion of the 7th St, Dutton Ave Line tracks in Oakland on 7th St, from Broadway to Pine St, for streetcar service to a shipyard and most of the 9th St track of the 9th St Line for the Richmond Shipyard Railway.