The Metropolitan lines began to be reshaped into the current Blue Line on February 25, 1951, when the CTA opened the Milwaukee-Dearborn Subway, connecting the Logan Square Branch with the Loop on a fast, efficient and more direct routing to downtown, rather than the previous circuitous route that saw these trains entering the Loop at the southwest corner. With opening of the Dearborn Subway, the old elevated alignment between Evergreen Portal and Marshfield Junction was decommissioned, used only for moving out-of-service rail cars. The northern section of the connection between Evergreen Avenue and Lake Street was demolished in the 1960s, leaving the Lake Street to Douglas Branch section—better known as the Paulina Connector—the only section still in operation. The Humboldt Park Branch was cut back to a full-time shuttle between Damen and Lawndale, and discontinued a year later on May 3, 1952.