The B41 is a bus route that constitutes a public transit line operating in Brooklyn, New York City, running along Flatbush Avenue between Downtown Brooklyn and Marine Park. The B41 is operated by the MTA New York City Transit Authority. Its precursor was a streetcar line that began operation in 1860, and was known as the Flatbush Avenue Line. The route became a bus line in 1951. Limited-stop service began along the route in 1992.