Question: a railroad that stretches from the east coast to the west coast is called the
[{'answer': 'transcontinental railroad', 'provenance': [{'wikipedia_id': '51916', 'title': 'Transcontinental railroad', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51916', 'title': 'Transcontinental railroad', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 414, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1492730136510462384}, 'section': 'Section::::Northern America.:United States of America.\n'}]}]