Question: what is the front part of a train called
[{'answer': 'locomotive', 'provenance': [{'wikipedia_id': '360820', 'title': 'Pilot (locomotive)', 'start_paragraph_id': 0, 'start_character': 7, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '360820', 'title': 'Pilot (locomotive)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 205, 'bleu_score': 0.8353820430191521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17911037974766956603}, 'section': 'Section::::Abstract.'}]}]