About the Manhattan Bridge See Acps110 I read the history site on the W train page It says When all four tracks on the Manhattan Bridge were restored on February 22 2004 the W was changed to its final service pattern as a weekday local between Whitehall Street South Ferry and Queens This means the W was local and the N was express That s when the Manhattan Bridge s north tracks reopen for the B and D trains Read more about the service history of the B D N Q and W train pages so you can get a better understand you meanie D