Question: when did the mumbai suburban railway start functioning
[{'answer': '16 April 1853', 'provenance': [{'wikipedia_id': '375013', 'title': 'Mumbai Suburban Railway', 'start_paragraph_id': 3, 'start_character': 350, 'end_paragraph_id': 3, 'end_character': 363, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '375013', 'title': 'Mumbai Suburban Railway', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 489, 'bleu_score': 0.653333140080262, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14726201082133719301}, 'section': 'Section::::History.\n'}]}]