Question: which is the most powerful engine in indian railways
[{'answer': 'The WAG - 9'}, {'provenance': [{'wikipedia_id': '6581082', 'title': 'Indian locomotive class WAG-9', 'start_paragraph_id': 1, 'start_character': 10, 'end_paragraph_id': 1, 'end_character': 603, 'bleu_score': 0.62133912958333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9537087801745154645}, 'section': 'Section::::Abstract.'}]}]