What is the largest rail yard in the New York City Subway system?
List of New York City Subway yards
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The Canarsie Yard (also known as AY or Atlantic Yard from its telegraphy letters) is located on the south end of the BMT Canarsie Line adjacent to Canarsie–Rockaway Parkway. Opened on October 26, 1917,[29] it is the primary layup yard for the L train and hosts the only car wash for the BMT Eastern Division.