Two maps from a transportation planning report dated 1948, showing proposed routes for trolley coaches (electric buses) and motor coaches (gasoline-powered buses). The first map shows bus lines throughout the greater Portland area, including a line to the city of Vanport, north of city limits near the Columbia River. It has a revision date of August 6, 1947, less than a year before Vanport was destroyed by a flood. The second map focuses on bus routes in the city center, and has a revision date of January 21, 1948.