Question: when was the stockton and darlington railway built
[{'answer': '1822', 'provenance': [{'wikipedia_id': '326299', 'title': 'Stockton and Darlington Railway', 'start_paragraph_id': 10, 'start_character': 1234, 'end_paragraph_id': 10, 'end_character': 1238, 'bleu_score': 1.0, 'section': 'Section::::Genesis.:George Stephenson.\n'}]}, {'provenance': [{'wikipedia_id': '326299', 'title': 'Stockton and Darlington Railway', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1448, 'bleu_score': 0.9076241417195061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 788203369256048586}, 'section': 'Section::::Genesis.:George Stephenson.\n'}]}]