 In 1941, the Boston Elevated Railway bought the BRB&L right of way from Day Square to Revere Beach for use as a high-speed trolley line similar to the Ashmont-Mattapan High Speed Line; these plans were delayed by the onset of World War II.However, the 1926 "Report on Improved Transportation Facilities" and 1945–47 "Coolidge Commission Report" recommended that the East Boston Tunnel line, which had been converted to rapid transit from streetcars in 1924, be extended to Lynn via the BBRB&L route rather than using it for a trolley line.In 1947, the newly formed Metropolitan Transit Authority (M.T.A.)