Busy city like New York, it is wise to take underground transportation. We were in long island area. We wanted to go to see statue of liberty and surrounding attractions. We are not so familiar with the area, and we are just visiting the place. SO we called the front desk where we were staying. They helped us and gave the schedule for subways and underground transportation. We wanted to leave around 10. So I look and there was a train which was leaving 9:50. We got ready before time, and there was a bus which dropped us at the station. We had to walk on bridge which took us to the other side and eventually we took stairs to go underground to catch the train. It was crowded, but train was on time. It stopped there for only couple of minutes. We got on and reached our destination on time. 
Question: How did they know which train to get on?
The front desk clerk at their hotel helped them