Question: who wrote this train is bound for glory
[{'answer': 'origins are unknown', 'provenance': [{'wikipedia_id': '35171608', 'title': 'This Train', 'start_paragraph_id': 1, 'start_character': 136, 'end_paragraph_id': 1, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35171608', 'title': 'This Train', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 435, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12013999211907564851}, 'section': 'Section::::Abstract.'}]}]