What does N&R trains mean?

Question

Of course you’re going to need more than the right genes to make you a good musician. Because while the N and R trains will take you there, the best way to get to Carnegie Hall remains practice!

Answer 1

This is a reference to the NYC subways lines.  In NYC, the subway lines are given letters or numbers and different colors.  The N and R lines will take you the Carnegie Hall stop @ 57 St./Seventh Avenue.

Answer 2

Train lines on the New York subway system are designated by letters, two of those lines are the N and R lines, which serve a station near Carneigie Hall

http://www.mta.info/nyct/maps/submap.htm

The most famous line in song is "Take The A Train"  

http://en.wikipedia.org/wiki/Take_the_A_...