1. Enter Grand Central Terminal and locate the subway entrance. It is near the Main Concourse, on the East Side of the terminal.
2. Swipe your MetroCard or purchase a single-ride ticket from the vending machines.
3. Follow the signs to the southbound 4, 5, 6, or 7 train platforms.
4. Take any of these trains heading towards Brooklyn.
5. Get off at the 59th Street/Columbus Circle station.
6. Follow the signs to exit the station and walk west on 59th Street towards Seventh Avenue.
7. Turn right onto Seventh Avenue and walk south to 55th Street.
The total walking distance is approximately 8 minutes.