The “L” train has been nicknamed the “hipster express” by some because the “L” goes into the newly gentrified Williamsburg.


http://en.wikipedia.org/wiki/L_%28New_York_City_Subway_service%29
The L 14th Street–Canarsie Local is a service of the New York City Subway, running local along the full length of the BMT Canarsie Line, 24 hours a day. The service is colored gray as the only route to use the Canarsie Line. For more information on the service, including history of the line, see the Canarsie Line article. The L is sometimes dubbed the Hipster Express [citation needed], a nickname coined for the gentrification of Williamsburg.


http://www.urbandictionary.com/define.php?term=L-train
L-train
A cross town train that runs along 14th Street in Manhattan and goes out to Brooklyn. Hipster Express: Better known for transporting hipsters from Williamsburg to the hipsters of the East Village and vice versa.
I took the L-train from the Bedford stop today but I didn’t wear my trucker hat so I felt out of place.
by Rufus McDoofus Nov 16, 2003 email it


http://www.greenpointusa.com/headlines/index.htm
East Village to Williamsburg Ferry?
Daily News
NOVEMBER 2nd, 2004
BY DEBORAH KOLBEN

The L has been unofficially dubbed the “hipster express” for the route it runs between increasingly trendy Williamsburg and Manhattan’s ever-trendy East Village.