by July 1905; the elevators were tested in January 1906. Atlantic Avenue station opened in the tunnel on April 5, 1906. The Atlantic Avenue and State Street stations had separate fare gates; a paper transfer was required to change lines. Modifications In August 1908, the elevated platform was again expanded southwards, this time to eight-car length—about —to match the length of platforms in the nearly-complete Washington Street Tunnel. An extension of the elevated mezzanine and a second exit stairwell from the elevated platform to the mezzanine opened on October 26, 1908. In 1926, significant repairs were made to the Atlantic Chamber (the headhouse of Atlantic Avenue station). Platform raising The East Boston Tunnel was originally planned to be operated with high-floor metro rolling stock and connected to the then-planned Cambridge Elevated line. When that plan was dropped in 1903 due to a disagreement between the BTC and the BERy, the stations were built with low platforms. Large bi-loading streetcars (with high floors but capable of loading from low platforms), which incorporated many attributes from metro cars used on the Main Line El, began use in 1905. However, neither these nor the large center-entrance cars introduced in 1917 (which were designed for multiple unit operation) could fully handle the crowds. In 1921, the Boston Transit Department (BTD)—the successor to the BTC—began work at Maverick Square to convert the East Boston Tunnel to high-floor metro trains. The next year, the BTD board approved the construction of high-level platforms at Atlantic Avenue, Devonshire, Scollay Under, and Bowdoin. Construction of concrete high-level platforms above the rails at Atlantic Avenue began in December 1923 or January 1924. A section of low-level platform was left to serve streetcars during construction. Over the weekend of April 18–21, 1924, the East Boston Tunnel was converted to high-floor metro stock. Temporary wooden platform sections were put in place to allow service to begin on April 21, with the permanent concrete sections completed by July 12. The elevators at Atlantic Avenue were also modified for the new platform heights. The edges of the original low platforms can still be seen under the high platforms. Fire and new headhouse The East Boston Tunnel cut sharply into East Boston ferry ridership, which in turn reduced connecting ridership on the Atlantic Avenue Elevated. The Elevated closed on September 30, 1938, and was torn down during World War II for scrap metal. With the