The BMT West End Line is a line of the New York City Subway, serving the Brooklyn communities of Sunset Park, Borough Park, New Utrecht, Bensonhurst, Bath Beach and Coney Island.

The original surface right-of-way was retained for use by trolley cars to provide local service and protect the company's franchise.

[8] On November 13, 1985, the New York City Transit Authority announced that an almost four-year-long renovation of the line would begin in spring 1986.

With the opening of the Chrystie Street Connection in late 1967, the B train from Manhattan was extended to Coney Island, absorbing the T and TT (both ran express on Fourth Avenue).

It ran local on Fourth Avenue during late night hours, but express at all other times.

In 2002, reconstruction of Coney Island–Stillwell Avenue resulted in the West End Line being the only line to serve the terminal and the W was extended full-time into Manhattan, using the local Fourth Avenue tracks and Montague Street Tunnel on weekends and late nights hours.

It terminated at Ninth Avenue during midday hours until 1995, when it was cut back to Chambers Street.

[12] Starting on September 18, 2021, and continuing until January 3, 2022, southbound D trains terminated at Bay 50th Street so work could be completed to protect Coney Island Yard from flooding.