It's impossible to say. It depends on where in Brooklyn you're coming from. Brooklyn is almost 100 square miles in area, and almost all of New York City's subway lines run through it. And several of the city's subway lines stop near 26 Federal Plaza. The directions will be entirely different, depending on which subway line is closest to your starting point.
Please ask another question and provide a precise point of origin (an address, a cross street, or at least a neighborhood). Be as specific as possible.
No, the G train does not go to Queens Plaza. The G train primarily operates between Brooklyn and Long Island City in Queens, but it does not serve the Queens Plaza station. To reach Queens Plaza, you can take the E, M, or R trains.
Are you asking if you can take the R train from the Atlantic Avenue-Pacific Street station to the Queens Plaza station? If so, then, yes, you can take the R train from Atlantic Avenue-Pacific Street to Queens Plaza, except from 11 PM to 5:30 AM, when there's no service. From 11 PM to 5:30 AM, I guess you could take the N train (on the same line, the N-R-Q-W, the yellow line) from Atlantic Avenue-Pacific Street to Queensboro Plaza (which is a different station a few blocks northwest of the Queens Plaza station) and walk the rest of the way.
To get to 26 Federal Plaza from Newark Penn Station, take a NJ Transit train to New York Penn Station. From there, transfer to the subway and take the 1, 2, or 3 train downtown to Chambers Street. After getting off at Chambers Street, walk a few blocks to reach 26 Federal Plaza. Alternatively, you can take a PATH train from Newark to World Trade Center and then walk to the plaza.
There is no train that goes to Rikers Island. You have to take the 7, N or W train to Queensboro Plaza then go to the street for the Q100 bus. Or the E, G, V or R train to Queens Plaza, go to the street and walk over to Queensboro Plaza (about a block) for the Q100 bus
Take the Q to 59th Street-Lexington Avenue in Manhattan. Transfer there to the Uptown R train, 1 stop, to Queens Plaza. Then exit the subway and walk 2 blocks along Queens Plaza South (where the Queensboro/59th Street Bridge runs) to 28th Street. The Q100 bus stops at 28th Street and Queens Plaza South, and travels over the Rikers Island Bridge to the Rikers Island Visitors Center.Note that Queens Plaza and Queensboro Plaza are two completely separate stations. The N and Q and stop at Queensboro Plaza. Only the R stops at Queens Plaza.
To travel from White Plains Road in the Bronx to 26 Federal Plaza in Manhattan, take the 2 train from White Plains Road station towards Flatbush Avenue. Transfer at 42nd Street-Times Square to the 1 train. Take the 1 train downtown to the Chambers Street station, which is a short walk to 26 Federal Plaza.
To catch the 1 train from Queens, you can take the R train to the 59th Street–Lexington Avenue station in Manhattan. From there, transfer to the 1 train at the same station. Alternatively, you can take the R train to the Times Square–42nd Street station, where you can also transfer to the 1 train. Both options provide convenient access to the 1 line from Queens.
The Q100 originates in Long Island City at 28th Street and Queens Plaza South and continues to the Rikers Island Visitors Center.To get there, walk 1 block west on Cortelyou Road to McDonald Avenue. Turn right, and walk 2 blocks north on McDonald Avenue to Church Avenue.Get the G train (the light green line) at the Church Avenue station (at the intersection of Church and McDonald Avenues), which is the Downtown end of the G line. Take the G from Church Avenue to Court Square, which is the Uptown end of the G line. So you'll be taking the G through its entire route.Transfer at Court Square to the Uptown E train (of the A-C-E, the blue line), 1 stop, from Court Square to Queens Plaza.Then exit the subway and walk 2 blocks along Queens Plaza South (where the Queensboro/59th Street Bridge runs) to 28th Street. The bus stops at 28th Street and Queens Plaza South.Alternate Route: if there are problems or service changes on the G line, you can instead take the Uptown Ftrain (of the B-D-F-M, the orange line) from Church Avenue to 34th Street-Herald Square in Manhattan, and transfer there to the Uptown R train (of the N-R-Q, the yellow line). Take the Uptown R from 34th Street-Herald Square to Queens Plaza.Note that Queens Plaza and Queensboro Plaza are two completely separate stations. The N and Q stop at Queensboro Plaza. Only the R stops at Queens Plaza.
To get to 225 Cadman Plaza in Brooklyn from Wantagh, NY by train, take the Long Island Rail Road (LIRR) from Wantagh Station to Atlantic Terminal in Brooklyn. From Atlantic Terminal, you can either walk or take the subway. If walking, head northwest on Flatbush Avenue, then turn left onto Hanson Place and continue onto Cadman Plaza. If you prefer the subway, you can take the 2 or 4 train from Atlantic Avenue to Borough Hall Station, which is close to Cadman Plaza.
You can take the #19 or #2 bus to 149th and Grand Concourse walk down 149th street half block toward Lincoln Hospital. 149Th street and Anthony J Griffin pl. there's a van that will take you over the Rikers Island Bridge to the Rikers Island Visit Center call (718-568-5685) You can take the 2 train to 125th Street, then transfer to the 6 train all the way to Rockaway Queens. Then take the bus Q101R to Rikers Island
To get from Ronkonkoma, NY, to Cadman Plaza in Brooklyn by train, take the Long Island Rail Road (LIRR) from Ronkonkoma Station to Penn Station in Manhattan. From Penn Station, transfer to the subway and take the 2, 3, 4, or 5 train to Borough Hall or the A or C train to Jay St-MetroTech. Cadman Plaza is a short walk from either subway station. Be sure to check the LIRR schedule for any service changes.
Take the shuttle (called the AirTrain) from inside the JFK terminals to the Howard Beach Station of the A train. The A train goes through Brooklyn. JFK is in Queens, and Brooklyn and Queens are two halves of one island. Queens is the north side, and Brooklyn is the south side.