Question: why were 11 miles of the cuckoo trail sold in 1986
[{'answer': 'to reduce expenditure', 'provenance': [{'wikipedia_id': '2877979', 'title': 'Cuckoo Trail', 'start_paragraph_id': 7, 'start_character': 404, 'end_paragraph_id': 7, 'end_character': 425, 'bleu_score': 1.0, 'section': 'Section::::Extension north.\n'}]}, {'provenance': [{'wikipedia_id': '2877979', 'title': 'Cuckoo Trail', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 550, 'bleu_score': 0.978606533029418, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11690125552059894236}, 'section': 'Section::::Extension north.\n'}]}]