Question: the major source of profits for promoters of interurban electric railroads was
[{'answer': 'issuing stock', 'provenance': [{'wikipedia_id': '393012', 'title': 'Interurban', 'start_paragraph_id': 19, 'start_character': 228, 'end_paragraph_id': 19, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::History.:Decline.\n'}]}, {'answer': 'selling bonds', 'provenance': [{'wikipedia_id': '393012', 'title': 'Interurban', 'start_paragraph_id': 19, 'start_character': 246, 'end_paragraph_id': 19, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::History.:Decline.\n'}]}, {'provenance': [{'wikipedia_id': '393012', 'title': 'Interurban', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 1883, 'bleu_score': 0.671560942743451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15576134409300175973}, 'section': 'Section::::History.:Decline.\n'}]}]