Question: when was the first train used in america
[{'answer': '1830', 'provenance': [{'wikipedia_id': '254044', 'title': 'Timeline of United States railway history', 'start_paragraph_id': 5, 'start_character': 33, 'end_paragraph_id': 5, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::1795-1829.\n'}]}, {'provenance': [{'wikipedia_id': '254044', 'title': 'Timeline of United States railway history', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 250, 'bleu_score': 0.8132493528194851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10499851276233732487}, 'section': 'Section::::1825-1832.\n'}]}]