Originally Posted by mbreuer
Actually, EWR-Penn Station. I believe you can then take the LIRR to JFK. Grand Central serves Metro-North, not Amtrak, NJ Transit or the LIRR... although I'm not sure about LIRR.
And if you take to the NJ Transit train to Penn Station, remember to go to
New York Penn Station, not Newark Penn Station.
Currently the LIRR does not go into Grand Central. That may change in the future.