CSL 7001 northbound at State and Washington, 1934. This experimental pre-PCC car transported visitors back and forth to A Century of Progress. Note that there are only three stars on the Chicago flag. The fourth star, symbolizing Fort Dearborn, was added in 1939. (CSL Photo)

CSL 7001 northbound at State and Washington, 1934. This experimental pre-PCC car transported visitors back and forth to A Century of Progress. Note that there are only three stars on the Chicago flag. The fourth star, symbolizing Fort Dearborn, was added in 1939. (CSL Photo)