The Metropolitan West Side Elevated Railroad (known as the Met or Polly "L") was the third elevated rapid transit line to be built in Chicago, Illinois and was the first of Chicago’s elevated lines to be electrically powered. The line ran from downtown Chicago to Marshfield Avenue with branches to Logan Square, Humboldt Park, Garfield Park, and Douglas Park (eventually extended to the suburb of Berwyn, Illinois). Portions of the line survive as the Blue and Pink lines of the Chicago "L" system.