in 1932, express (A) and local (AA) trains served the line; expresses did not run during late nights or Sundays. When the IND Concourse Line opened on July 1, 1933, the C was added to the express service, while all locals became CC trains to the Concourse Line. The E was added to the local tracks south of 50th Street on August 19, 1933, when the IND Queens Boulevard Line opened. The lower level opened on January 1, 1936, as one of four stations on the first part of the Sixth Avenue Line. Two local tracks split from a junction with the Eighth Avenue Line south of West Fourth Street–Washington Square, running east under Houston Street and south under Essex Street to a temporary terminal at East Broadway. Initially, E trains would split from the upper level and run to Church Avenue. When further sections of the Sixth Avenue Line opened on December 15, 1940, the F train replaced the E train at the lower level of the West Fourth Street station. The Sixth Avenue Line's Midtown section, comprising the section between the West Fourth Street and 34th Street–Herald Square stations, originally did not have express tracks. On April 19, 1961, ground was broken for a $22 million project to build two express tracks between these two stations. On November 26, 1967, the express tracks started to be used by the B and D trains. At that time, the first part of the Chrystie Street Connection opened, connecting the express tracks at the Broadway–Lafayette Street station one stop south to the Manhattan Bridge. On July 1, 1968, another section of the Chrystie Street Connection opened, allowing Sixth and Eighth Avenue local trains to use the Williamsburg Bridge. The Williamsburg Bridge connection has been used by the M train since 2010. In 2002, the Metropolitan Transportation Authority announced that elevators would be installed at the West Fourth Street station. The elevator installation was delayed by over a year and was finally completed in April 2005, but the elevators then suffered from frequent breakdowns. In 2005 alone, the three elevators were out of service for a cumulative nine months, and one elevator was closed off for 134 days. That year, passengers made 57 complaints about the elevators, including seven instances in which riders were trapped in the elevators. Consequently, disability-rights groups sued the MTA over the elevators. Station layout The West Fourth