Northern Blvd appears as a simple IND Queens Blvd Line Local Station, but beneath the station there is more complexity. For most of the station, coming from the Forest-Hills bound direction, the Express tracks are located one level down beneath the local tracks. At the western end of the station, where Northern Blvd crosses Broadway, the express tracks curve south to deviate from the same route as the local tracks and follow Northern Blvd until the local tracks curve off of Steinway Street, between the 36th Street and Steinway Street Stations and rejoin the express tracks.
The station has no mezzanine, and in turn no free crossover or under, each platform has its one exit to Northern Blvd at the western most ends of the platform with the turnstiles directly alongside the platform, the Manhattan-bound platform contains the 24 hour token booth and a single streetstair up to the NE corner of Broadway & Northern Blvd, just west of the Intersection of 54th Street (that meets at a diagonal intersection). The Forest Hills-bound platform contains a former token booth (only open during rush hours when I visited in 2008) with the only way to enter the Forest Hills-bound platform other times via High Entrance/Exit Turnstiles. This leads out to a single streetstairs at the SW corner of Northern Blvd & 54th Street, at the 6-way intersection with Broadway.
There is an abandoned exit from the Forest Hills-bound platfrom at the extreme western end of the platform, just west of this fare control area (I assume, using a small amount of platform fencing the fare control area was shared when this was open, unless these were exit only), here was first a streetstair up to the triangle formed by Northern Blvd and Broadway at the western end of this unique intersection, followed by a passageway above the express tracks (that have curved to follow Northern Blvd), leading to another slabbed over streetstair up to the southside of Northern Blvd around the corner from the current entrance.
There is some evidence of a former exit at the western end of the platform, with a portion of the wall that is lacking name tablets and only has the purple line of the trim. There are still signs for this exit at 56th St underneath some of the name tablets. These exits to 56th Street used to lead to small fare control areas along each platform leading up to a single streetstair to the NE and SE corners of 56th Street & Broadway from the Manhattan-bound and Forest Hills-bound platforms respectively.
Photos 1-11: June 5, 2008; 12-18: September 3, 2023
Station Subway Lines (2001-2010)