Which subway do you take from Penn Station to Top of the Rock?

Take the Downtown A or C trains (of the A-C-E, the blue line) or the Downtown 2 or 3trains (of the 1-2-3, the red line) from 34th Street-Penn Station to Fulton Street.

Transfer at Fulton Street to the Uptown 4 or 5 (of the 4-5-6, the dark green line), one stop, from Fulton Street to Brooklyn Bridge-City Hall.