Yes, the 3 train stops at Penn Station. All trains on the 1-2-3 line (the red line) and the A-C-E line (the blue line) stop at Penn Station.
However, the 3 does NOT stop at Penn Station from 11:30 PM to 6 AM. During those times, the line ends at 42nd Street-Times Square.
Take the 7 train to times square and then take the 1 2 or 3 train downtown 1 stop to Penn Station.
No, the N train (of the N-R-Q-W, the yellow line) does not stop at Penn Station. But it stops at Times Square. Take the Uptown 1 train (of the 1-2-3, the red line) one stop, from 34th Street-Penn Station to 42nd Street-Times Square, then transfer at Times Square to the N.
Take the Uptown 1-2-3 (the red line), 1 stop, from 34th Street-Penn Station to 42nd Street-Times Square. Transfer at Times Square to the R.
Take the Downtown 1 train (of the 1-2-3, the red line), 1 stop, from 34th Street-Penn Station to 28th Street (at 7th Avenue).
They are both on the New York Subway system, but you'll have to transfer. The best way to get from Grand Central Station to Penn Station is to take the "S" train to Times Square and then take the "1", "2", or "3" trains heading Downtown. The 34th Street stop is by Penn Station. The subway map calls the A, C, E 34th Street stop the Penn Station stop, but the 1, 2, 3 34th Street stop is just as close; walking from the "S" train to the A, C, or E would take awhile since there is a lengthy walk from the S stop on 7th Avenue to the A, C, E stop on 8th Avenue. It's not worth that.
From JFK you can take the air-tram to the Howard Beach/JFK airport stop on the A subway line. That is an express train that goes to 34th street-penn station. Getting off at this stop puts you directly in Penn Station, all you have to do is follow the signs. If you are coming from Penn Station going to JFK airport, make sure to get a on JFK/Far Rockaway bound A train, there are 3 different A trains.
Take the Uptown 1-2-3 (the red line) one stop, from 34th Street-Penn Station to 42nd Street-Times Square. Transfer at Times Square to the R train.
Yes. Take the Downtown 2 train (of the 1-2-3, the red line) from 34th Street-Penn Station to Flatbush Avenue-Brooklyn College.
There is no train that runs directly between Penn Station and Grand Central. You have to take the subway: the Uptown 1-2-3(the red line), 1 stop, from 34th Street-Penn Station to 42nd Street-Times Square, then transfer to the S shuttle train (color grey) to 42nd Street-Grand Central.Trains on the New York City subway system operate continuously. There are schedules you can download, but they're often inaccurate.
Take the Uptown 1 train (of the 1-2-3, the red line) from 34th Street-Penn Station to 66th Street-Lincoln Center (at Broadway).
Take the Uptown 1-2-3 (the red line) from 34th Street-Penn Station to 42nd Street-Times Square, and transfer there to the N.
Take the Uptown E train (of the A-C-E, the blue line), 3 stops, from 34th Street-Penn Station to 7th Avenue.Transfer at 7th Avenue to the Downtown B or Dtrains (of the B-D-F-M, the orange line), 1 stop, to 47th-50th Street-Rockefeller Center.