Because of weekend construction, N trains were running between Ditmars Blvd in Queens and Bay Parkway in Brooklyn.....but, via the D line. Shuttle buses made all N train stops between 36th Street and Coney Island. I believe a G.O of this size was done for station rehabilitation at some stations along with structural work and other stuff. Seen here is a train of R160Bs with Siemens Propulsion operating on the N to Bay Parkway via the D line arriving and departing from Canal Street.