text: <START_QUESTION> a little girl is riding and said mommy are we going to catch up with the train the little girl's mother asked what train the little girl laughs and says the one that just came through. the mother then then asks the girl how does she know a train came through. how does the little girl know this? <END_QUESTION>
  <ANSWER> it left its tracks <END_ANSWER><|endoftext|>