Task: Question Answering
Input (English): It was my first time in London so my anxiety was pretty high, but I still managed to approach the ticket seller who was actually very nice. The lady sold me a ticket and then directed me through the gate with the turn style entry. I walked down several flights of stairs that had a central corner landing. A man sat cross legged playing guitar, he seemed very happy with his life, I dropped a pound coin into his upside down hat in front of him, he smiled and I smiled back. I continued down the stairs to king's cross and awaited the train I would be boarding. After about 17 mins the train was heard approaching. The train screeched to a halt at the platform on the southbound side where I was. Once all of the patrons exited the train I boarded and sat next to a bald woman with a pet iguana on her shoulders. The subway smelled of urine and B.O. but it was cheap and I liked people watching, especially in a foreign city at thirteen years old. 
Question: Why were they taking the underground?
Output (English): To get to their destination