"It was opened in 1904
with the hope of making it the crowning glory of the New York subway system in elegant architecture and a place for commemorative plaques to honour the work that had resulted in such a successful underground mass transit system. It was to be the original southern terminus of the first ‘Manhattan Main Line’; however the station was closed and boarded up in 1945.
The gem of the underground began gathering dust, forgotten by the general public, as passengers were forced off at the Brooklyn Bridge Stop before the train continued on to the terminus to make its turnaround. The reason for its closure
was that newer longer cars were required to match the demand of passengers that passed through the system. But as the stations tracks were severely curved
, a dangerous gap between the train doors and the platform was formed making it an unsafe area. This combined with the fact that only about 600 people used it, resulted in its closure with only mythical plans of turning it into a transit museum. But this was never followed
through."... via Instapundit