Dual Contracts lines in the borough, along with the Astoria Line; it would connect Flushing and Long Island City, two of Queens' oldest settlements, to Manhattan via the Steinway Tunnel. When the majority of the line was built in the early 1910s, most of the route went through undeveloped land, and Roosevelt Avenue had not been constructed. Community leaders advocated for more Dual Contracts lines to be built in Queens to allow development there. The Flushing Line west of 103rd Street opened in 1917. The IRT agreed to operate the line under the condition that any loss of profits would be repaid by the city. In 1923, the BMT started operating shuttle services along the Flushing Line, which terminated at Queensboro Plaza. As part of the Dual Contracts, the PSC would build the line eastward to at least Flushing. Three stations at Main Street, Willets Point Boulevard, and 111th Street were approved in 1921 as part of an extension of the Flushing Line past 103rd Street. Construction of the station and the double-deck bridge over the Flushing Creek began on April 21, 1923. The line to Main Street had been practically completed by 1925, but it had to be rebuilt in part due to the sinking of the foundations of the structure in the vicinity of Flushing Creek. Once the structure was deemed to be safe for operation, the line was extended to Willets Point Boulevard on May 7, 1927. The station's opening was formally celebrated on that date, coinciding with the opening of the Roosevelt Avenue Bridge for cars and buses. Until the Main Street station was completed, trains temporarily terminated at Willets Point Boulevard, where passengers boarded a shuttle bus to travel across the creek to Flushing. The Willets Point Boulevard extension was served by shuttle trains from 111th Street until through service was inaugurated on May 14. The BMT used wooden elevated rolling stock, as the Flushing Line was built to IRT clearances, and standard steel BMT subway rolling stock were not compatible. Furthermore, because the Main Street station was underground, all elevated trains on the Flushing Line had to terminate at Willets Point Boulevard, as elevated trains were banned in subway tunnels. On January 22, 1928, the line was extended one stop east to Main Street. Afterward, Willets Point Boulevard was by far the least used station on the Flushing Line; it recorded 66,042 entries in