Task: Question Answering
Input (English): Last week when I took a trip into the city I had to ride on the underground to get from one place to another. There are stations all around the city, so I had to find the one that was closest to my destination so I wouldn't have to walk too far after I got off. When I got to the station, I walked down the stairs that led into the underground and went over to the kiosk so I could pay my fee. After I paid my fee I took the ticket and went through the turnstile towards the train. I had to wait with a group of people for the train to arrive, but it didn't take very long. When the train got to my station the doors slowly slid open and everyone walked inside. We found our seats and waited patiently for the train to start moving. I didn't take long. Soon, a nice voice came over the intercom announcing my destination was the next stop, so I stood up and waited to exit the train. 
Question: Why are they riding the train?
Output (English): The person was taking a trip into the city?