the eastbound track (railroad north) is above the westbound track, with both tracks on the south side of the island platforms. On the north side of these platforms is the BMT Astoria Line. East of this point, both the Flushing Line and the Astoria Line were formerly operated by the IRT and the BMT. Connections still exist between the eastbound tracks just east of the platforms, but cannot be used for revenue service as BMT trains are wider than IRT trains. This is the only track connection between the Flushing Line and the rest of the subway system. West of Queensboro Plaza, the line sharply turns south onto an elevated structure over 23rd Street. It heads into the west end of Amtrak's Sunnyside Yard, and passes through two underground stations before entering Manhattan via the Steinway Tunnel under the East River. In Manhattan, the line runs under 42nd Street, with part directly underneath the 42nd Street Shuttle (), before angling towards 41st Street. The Times Square–42nd Street station, with no track connections to other lines, is directly under 41st Street. West of Times Square, the tracks curve sharply downward before turning under 11th Avenue. The tracks end at 24th Street, even though the last station is at 34th Street. This segment was built as part of the extension of the Flushing Line west to Manhattan's Far West Side (see ). A decommissioned lower level at the IND Eighth Avenue Line's 42nd Street–Port Authority Bus Terminal station formerly blocked the way. Although London ultimately received the bid for the 2012 Summer Olympics, New York City pursued the extension anyway, albeit as a means to enable the redevelopment of the far West Side under the Hudson Yards Redevelopment Project. Distinctions The Flushing Line is one of only two New York City non-shuttle subway lines that hosts only a single service and does not share operating trackage with any other line or service; the other is the BMT Canarsie Line, carrying the train. Because of this, the MTA is automating the line with new trains using communication-based train control (CBTC), similar to the Canarsie Line (see ). The IRT Flushing Line's 7 service has the distinction of running trains with the largest number of cars in the New York City Subway. 7 trains are eleven cars long; most other New York City Subway services run ten or eight-car trains. The trains are not