Conversion from the trolley bus to motor bus began in 1938 and progressed rapidly. 

On midnight, September 22, 1934, Hydro Electric terminated its operating agreement with the SW&A Railway Company. There was little advance warning of this action. The company suddenly found itself in dire straits with few cash reserves and steadily increasing annual losses.

Facts

• Conversion of Windsor's streetcar lines to motor buses did not begin until relatively late - 1938 - but once underway, proceeded very rapidly: within fourteen months the transit system had been completely motorized.
  
  
• The Erie trolley line was converted to motor bus on February 19, 1939, and Windsor's last electric car line (and its most heavily-traveled route), the Crosstown, followed on May 7, 1939.
  
  
• Some of the old streetcars were sold for further service in South America.
  
  
• During 1938 and 1939, the SW&A men were taught new skills: the streetcar mechanics learned to maintain buses, while the motormen and conductors were taught to drive them.