Question: when was the first railway line built in britain
[{'answer': '1825', 'provenance': [{'wikipedia_id': '282643', 'title': 'History of rail transport in Great Britain', 'start_paragraph_id': 12, 'start_character': 456, 'end_paragraph_id': 12, 'end_character': 460, 'bleu_score': 1.0, 'section': 'Section::::Before 1830: The pioneers.\n'}]}, {'provenance': [{'wikipedia_id': '282643', 'title': 'History of rail transport in Great Britain', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 573, 'bleu_score': 0.944515869221328, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6177529188011695644}, 'section': 'Section::::Before 1830: The pioneers.\n'}]}]