On Nov. 5, 1888, the Fifth Avenue Brooklyn Rapid Transit Elevated line opened, carrying passengers from Fulton Ferry just across the Brooklyn Bridge (which opened in 1883) through downtown Brooklyn to Bay Ridge. At the bottom of the top pic, you'll see passengers waiting to board streetcars, while construction is taking place along the tracks.
Like most BK lines, funding in large part came from developers of Coney Island, who wanted to make it easy for all New Yorkers to reach the beach. The line also connected with the Long Island Railroad.
It was efficient, but what a bloody mess, huh? In 1940, the line was demolished, along with the majority of elevated lines in New York City. (Photos: NYC Vintage Images)