user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: bharat heavy electricals limited builds what class of locomotives? 
Knowledge Triplets: Government of India, organization.organization_founder.organizations_founded, National Jute Manufactures Corporation Limited
Government of India, award.award_presenting_organization.award_categories_presented, National Child Award for Exceptional Achievement
Telangana State Tourism Development Corporation, government.government_agency.government, Government of India
Central Plan Scheme Monitoring System, government.government_agency.government, Government of India
Government of India, government.government.agency, Central Plan Scheme Monitoring System
Government of India, government.governmental_body.members, m.0134cl5d
Bharat Heavy Electricals, organization.organization.founders, Government of India
Government of India, business.employer.employees, m.0_q_t5h
Government of India, government.government.agency, Ministry of Ayurveda, Yoga and Naturopathy, Unani, Siddha and Homoeopathy
Government of India, award.award_presenting_organization.award_categories_presented, Wound Medal
m.0n4wwmm, organization.leadership.organization, Bharat Heavy Electricals
South Central Railway zone, government.government_agency.government, Government of India
Best Engineering Colleges in Tamilnadu, award.ranked_list.ranked_by, Government of India
Chief Commissioner of Income Tax Central, government.government_agency.government, Government of India
Government of India, government.governmental_jurisdiction.agencies, National Institute of Ocean Technology
Government of India, government.government.agency, National Investigation Agency
Bharat Heavy Electricals, organization.organization.leadership, m.0n4wwmm
m.0n5rj1d, dataworld.gardening_hint.last_referenced_by, Bharat Heavy Electricals
Jawaharlal Nehru Award for International Understanding, award.award_category.presenting_organization, Government of India
Government of India, government.government.agency, Central Institute of Brackish Water Aquaculture
m.0b67gc_, base.yupgrade.user.topics, Government of India
m.0n4wwmm, organization.leadership.from, 2009-10-01
Government of India, award.award_presenting_organization.award_categories_presented, Padmabhushan Dr. Moturi Satyanarayan Award
Indian locomotive class WAG-5, rail.locomotive_class.uic_classification, Co′Co′
m.010vsb4w, organization.organization_relationship.parent, Government of India
Government of India, business.employer.employees, m.0x0t_8q
Government of India, government.governmental_jurisdiction.agencies, Board of Radiation and Isotope Technology
Government of India, government.governmental_jurisdiction.agencies, Crime and Criminal Tracking Network and Systems
Government of India, government.government.agency, Investigation Division of the Central Board of Direct Taxes
Government of India, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-d0d8
Government of India, business.employer.employees, m.0ybmjjm
Government of India, government.governmental_body.members, m.0134cl4l
DigiLocker, government.government_agency.jurisdiction, Government of India
Government of India, government.government.agency, Telangana State Tourism Development Corporation
m.0h6yvbj, business.employment_tenure.company, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Padma Bhushan
Government of India, government.government.agency, Central Bureau of Investigation
m.0131gn0l, organization.organization_relationship.parent, Government of India
m.0134cl5d, government.government_position_held.governmental_body, Government of India
Government of India, business.employer.employees, m.0x19b37
Government of India, award.ranked_list_compiler.ranked_lists, Best Engineering College in Tamilnadu
Doordarshan, organization.organization.founders, Government of India
Integrated Child Development Services, government.government_agency.government, Government of India
Ganga Sharan Singh Award, award.award_category.presenting_organization, Government of India
Ministry of Information and Broadcasting, government.government_agency.jurisdiction, Government of India
Indian Forest Service, government.government_agency.government, Government of India
Government of India, government.governmental_jurisdiction.agencies, Nuclear Command Authority
Bharat Heavy Electricals, organization.organization.headquarters, m.0whtpp_
Government of India, government.governmental_jurisdiction.agencies, Income Tax Department
Government of India, government.governmental_jurisdiction.agencies, Ministry of Information and Broadcasting
India, government.governmental_jurisdiction.government, Government of India
m.0h91179, business.employment_tenure.company, Bharat Heavy Electricals
National Crime Records Bureau, government.government_agency.jurisdiction, Government of India
m.0_q_t5h, business.employment_tenure.company, Government of India
Padmabhushan Dr. Moturi Satyanarayan Award, award.award_category.presenting_organization, Government of India
Indian locomotive class WAG-5, rail.locomotive_class.built_by, Bharat Heavy Electricals
Bharat Ratna, award.award.presented_by, Government of India
Uttam Jeevan Raksha Padak, award.award_category.presenting_organization, Government of India
Government of India, government.governmental_body.offices_positions, Chief Commissioner of Income Tax
m.0134ckvz, government.government_position_held.governmental_body, Government of India
Stree Shakti Puraskar, award.award_category.presenting_organization, Government of India
Finance Commission of India, government.government_agency.jurisdiction, Government of India
Government of India, government.government.agency, Department of Scientific and Industrial Research
Serious Fraud Investigation Office, government.government_agency.government, Government of India
m.0zdcpc4, projects.project_participation.participant, Government of India
Indian locomotive class WAG-7, base.train.electric_train_class.electric_system_s, 25 kV AC railway electrification
Enforcement Directorate, government.government_agency.government, Government of India
Crime and Criminal Tracking Network and Systems, government.government_agency.jurisdiction, Government of India
m.0whtpp_, location.mailing_address.postal_code, 110049
m.0n4wwmm, organization.leadership.role, CEO
Government of India, organization.organization_founder.organizations_founded, Bharat Heavy Electricals
Government of India, government.governmental_jurisdiction.agencies, Regional Meteorological Centre, Chennai
Sarvottam Jeevan Raksha Padak, award.award_category.presenting_organization, Government of India
National Investigation Agency, government.government_agency.government, Government of India
Government of India, government.governmental_jurisdiction.agencies, Telecom Enforcement Resource and Monitoring
Central Information Commission, government.government_agency.government, Government of India
Board of Radiation and Isotope Technology, government.government_agency.jurisdiction, Government of India
Government of India, business.employer.employees, m.0123xr49
Ministry of Earth Sciences, government.government_agency.jurisdiction, Government of India
m.0wkr5jx, business.employment_tenure.company, Government of India
m.0123xr49, business.employment_tenure.company, Government of India
Government of India, organization.organization_founder.organizations_founded, Films Division of India
Ministry of Statistics and Programme Implementation, government.government_agency.government, Government of India
Padma Bhushan, award.award_category.presenting_organization, Government of India
Government of India, award.award_presenting_organization.awards_presented, Arjuna Award
Government of India, award.award_presenting_organization.award_categories_presented, Jawaharlal Nehru Award for International Understanding
Government of India, government.governmental_jurisdiction.agencies, Finance Commission of India
Competition Commission of India, government.government_agency.jurisdiction, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Padma Vibhushan
Government of India, award.award_presenting_organization.award_categories_presented, Mahapandit Rahul Sankrityayan Award
Arjuna Award, award.award.presented_by, Government of India
m.0_xnlbs, organization.organization_relationship.parent, Government of India
Operation Green Hunt, base.culturalevent.event.entity_involved, Government of India
Chief Commissioner of Income Tax, government.government_office_or_title.jurisdiction, Government of India
m.0z4hk46, business.employment_tenure.company, Government of India
Government of India, government.government.agency, Central Economic Intelligence Bureau
Advisor, Telecom Regulatory Authority of India, government.government_office_or_title.jurisdiction, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Bharat Ratna
Government of India, award.award_presenting_organization.award_categories_presented, Sarvottam Jeevan Raksha Padak
Subramanyam Bharti Award, award.award_category.presenting_organization, Government of India
Government of India, government.government.agency, Raja Ramanna Centre for Advanced Technology
Government of India, organization.organization.operates_government_service, Anganwadi
Government of India, business.employer.employees, m.0123x1g2
Government of India, award.award_presenting_organization.awards_presented, Bharat Ratna
m.0tdm2wm, dataworld.gardening_hint.last_referenced_by, m.0n5rj1d
Telecom Enforcement Resource and Monitoring, government.government_agency.jurisdiction, Government of India
Government of India, organization.organization.child, m.0pcd_s1
BHARAT HEAVY ELECTRICALS Common Stock, business.issue.type_of_issue, Common stock
m.0n4wwmm, organization.leadership.person, B. Prasada Rao
Raja Ramanna Centre for Advanced Technology, government.government_agency.government, Government of India
Government of India, government.governmental_jurisdiction.agencies, Sixth Central Pay Commission
Government of India, government.government.agency, Ministry of Statistics and Programme Implementation
Indian Council for Cultural Relations, government.government_agency.government, Government of India
Government of India, government.government.agency, Bureau of Police Research and Development
Government of India, award.award_presenting_organization.award_categories_presented, Ganga Sharan Singh Award
Vikram Sarabhai Space Centre, government.government_agency.jurisdiction, Government of India
National Council of Educational Research and Training, organization.organization.founders, Government of India
National Institute of Ocean Technology, government.government_agency.jurisdiction, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Stree Shakti Puraskar
Government of India, government.governmental_jurisdiction.agencies, Competition Commission of India
Government of India, government.government.agency, Chief Commissioner of Income Tax Central
Government of India, government.governmental_jurisdiction.agencies, Ministry of Earth Sciences
Atomic Energy Commission of India, government.government_agency.jurisdiction, Government of India
Employees' Provident Fund Organisation of India, government.government_agency.government, Government of India
Government of India, organization.organization.child, m.0131gn0l
Government of India, business.employer.employees, m.0h6yvbj
Government of India, government.governmental_jurisdiction.agencies, Atomic Energy Commission of India
Indian locomotive class WAG-5, rail.locomotive_class.introduced, 1984
Government of India, projects.project_participant.projects, m.0zdcpc4
Wound Medal, award.award_category.presenting_organization, Government of India
Government of India, government.governmental_jurisdiction.agencies, Liquid Propulsion Systems Centre
Bharat Heavy Electricals, rail.locomotive_builder.locomotive_classes_built, Indian locomotive class WAG-7
Rajiv Gandhi Khel Ratna, award.award_category.presenting_organization, Government of India
Central Electricity Regulatory Commission, government.government_agency.jurisdiction, Government of India
Sixth Central Pay Commission, government.government_agency.jurisdiction, Government of India
Best Engineering College in Tamilnadu, award.ranked_list.ranked_by, Government of India
Bharat Ratna, award.award_category.presenting_organization, Government of India
m.0whtpp_, location.mailing_address.country, India
Government of India, business.employer.employees, m.0wkr5jx
Bharat Heavy Electricals, rail.locomotive_builder.locomotive_classes_built, Indian locomotive class WAG-5
Government of India, base.schemastaging.organization_extra.contact_webpages, m.010h1ccw
Government of India, award.ranked_list_compiler.ranked_lists, Best Engineering Colleges in Tamilnadu
Government of India, award.award_presenting_organization.award_categories_presented, Dr. George Grierson Award
BSE:BHEL, business.stock_ticker_symbol.issue, BHARAT HEAVY ELECTRICALS Common Stock
Government of India, government.governmental_jurisdiction.agencies, Unique Identification Authority of India
Bharat Heavy Electricals, business.employer.employees, m.0h91179
Board of Secondary Education, Madhya Pradesh, government.government_agency.government, Government of India
Sahitya Akademi Fellowship, award.award_category.presenting_organization, Government of India
m.0_3r6ft, business.employment_tenure.company, Government of India
Central Institute of Brackish Water Aquaculture, government.government_agency.government, Government of India
Bharat Heavy Electricals, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0082-20f1
Government of India, government.government.agency, National Board of Examinations
Pushpendra Saran, people.person.employment_history, m.0h91179
Government of India, government.government.agency, Central Information Commission
BHARAT HEAVY ELECTRICALS Common Stock, business.issue.trading_symbol, BSE:BHEL
Government of India, government.governmental_jurisdiction.agencies, ISRO Propulsion Complex
Government of India, government.governmental_jurisdiction.agencies, DigiLocker
Government of India, business.employer.employees, m.0zncm0q
Department of Scientific and Industrial Research, government.government_agency.government, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Dronacharya Award
Government of India, business.employer.employees, m.0z4hhhp
Government of India, award.award_presenting_organization.award_categories_presented, Subramanyam Bharti Award
Government of India, organization.organization.child, m.010vsb4w
Government of India, organization.organization_founder.organizations_founded, Akashvani
ISRO Propulsion Complex, government.government_agency.jurisdiction, Government of India
m.0qshv64, dataworld.gardening_hint.last_referenced_by, Government of India
National Child Award for Exceptional Achievement, award.award_category.presenting_organization, Government of India
Common stock, business.issue_type.issues_of_this_type, BHARAT HEAVY ELECTRICALS Common Stock
Government of India, award.award_presenting_organization.award_categories_presented, National Bravery Award
m.0ybmjjm, business.employment_tenure.company, Government of India
B. Prasada Rao, business.board_member.leader_of, m.0n4wwmm
m.0x0t_8q, business.employment_tenure.company, Government of India
Government of India, government.government.government_for, India
m.0whtpp_, location.mailing_address.street_address, BHEL House, Siri Fort
m.0n5rj1d, type.object.permission, m.019h
Government of India, organization.organization_founder.organizations_founded, Doordarshan
Bharat Heavy Electricals, organization.organization.date_founded, 1964
Government of India, government.governmental_jurisdiction.government_positions, Advisor, Telecom Regulatory Authority of India
Government of India, business.employer.employees, m.012hc9t6
m.0whtpp_, location.mailing_address.state_province_region, Delhi
Padma Vibhushan, award.award_category.presenting_organization, Government of India
BHARAT HEAVY ELECTRICALS Common Stock, business.issue.issuer, Bharat Heavy Electricals
Government of India, organization.organization_founder.organizations_founded, Performance Management Division
Government of India, government.governmental_jurisdiction.agencies, Vikram Sarabhai Space Centre
Government of India, business.employer.employees, m.0z4hk46
Bharat Heavy Electricals, business.issuer.issue, BHARAT HEAVY ELECTRICALS Common Stock
Regional Meteorological Centre, Chennai, government.government_agency.jurisdiction, Government of India
Liquid Propulsion Systems Centre, government.government_agency.jurisdiction, Government of India
Central Vigilance Commission, government.government_agency.government, Government of India
Akashvani, organization.organization.founders, Government of India
m.0z4hhhp, business.employment_tenure.company, Government of India
Central Bureau of Investigation, government.government_agency.government, Government of India
Anganwadi, government.government_service.operating_organization, Government of India
Investigation Division of the Central Board of Direct Taxes, government.government_agency.government, Government of India
m.0wj1h_v, organization.organization_relationship.parent, Government of India
Government of India, government.government.agency, South Central Railway zone
m.0123x1g2, business.employment_tenure.company, Government of India
m.0cp73dt, dataworld.gardening_hint.replaced_by, Bharat Heavy Electricals
Government of India, government.governmental_body.members, m.0134ckvz
Government of India, government.government.agency, Indian Forest Service
Performance Management Division, organization.organization.founders, Government of India
m.012hc9t6, business.employment_tenure.company, Government of India
Dr. George Grierson Award, award.award_category.presenting_organization, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Rajiv Gandhi Khel Ratna
Government of India, government.governmental_jurisdiction.agencies, Central Electricity Regulatory Commission
Indian locomotive class WAG-5, base.train.electric_train_class.electric_system_s, 25 kV AC railway electrification
Ministry of Ayurveda, Yoga and Naturopathy, Unani, Siddha and Homoeopathy, government.government_agency.government, Government of India
m.019h, type.permission.controls, m.0n5rj1d
Government of India, government.government.agency, Enforcement Directorate
Government of India, award.award_presenting_organization.award_categories_presented, Sahitya Akademi Fellowship
Government of India, government.governmental_jurisdiction.agencies, National Crime Records Bureau
National Bravery Award, award.award_category.presenting_organization, Government of India
Dronacharya Award, award.award_category.presenting_organization, Government of India
Films Division of India, organization.organization.founders, Government of India
Chief Commissioner of Income Tax, government.government_office_or_title.governmental_body_if_any, Government of India
Central Economic Intelligence Bureau, government.government_agency.government, Government of India
m.0whtpp_, location.mailing_address.citytown, New Delhi
m.0134cl4l, government.government_position_held.governmental_body, Government of India
Indian locomotive class WAG-7, rail.locomotive_class.uic_classification, Co′Co′
National Jute Manufactures Corporation Limited, organization.organization.founders, Government of India
Government of India, business.employer.number_of_employees, m.0kj0y9l
Government of India, organization.organization_founder.organizations_founded, National Council of Educational Research and Training
m.0zncm0q, business.employment_tenure.company, Government of India
Government of India, government.governmental_jurisdiction.agencies, National Disaster Response Force
Mahapandit Rahul Sankrityayan Award, award.award_category.presenting_organization, Government of India
CEO, organization.role.leaders, m.0n4wwmm
Bharat Heavy Electricals, rail.locomotive_class.built_by, Indian locomotive class WAG-7
Nuclear Command Authority, government.government_agency.jurisdiction, Government of India
Government of India, organization.organization.child, m.0wj1h_v
Unique Identification Authority of India, government.government_agency.jurisdiction, Government of India
Government of India, government.government.agency, Employees' Provident Fund Organisation of India
Government of India, government.government.agency, Integrated Child Development Services
Government of India, government.governmental_jurisdiction.government_positions, Chief Commissioner of Income Tax
Government of India, government.government.agency, Central Vigilance Commission
Government of India, organization.organization.child, m.0_xnlbs
m.0pcd_s1, organization.organization_relationship.parent, Government of India
Bureau of Police Research and Development, government.government_agency.government, Government of India
Government of India, government.government.agency, Board of Secondary Education, Madhya Pradesh
m.0n4wwmm, organization.leadership.title, Chairman and Managing Director
Government of India, business.employer.employees, m.0_3r6ft
National Disaster Response Force, government.government_agency.jurisdiction, Government of India
m.0x19b37, business.employment_tenure.company, Government of India
Government of India, government.government.agency, Indian Council for Cultural Relations
Government of India, government.government.agency, Serious Fraud Investigation Office
National Board of Examinations, government.government_agency.government, Government of India
Government of India, award.award_presenting_organization.award_categories_presented, Uttam Jeevan Raksha Padak
m.0h91179, business.employment_tenure.person, Pushpendra Saran
Indian locomotive class WAG-7, rail.locomotive_class.built_by, Bharat Heavy Electricals
Income Tax Department, government.government_agency.jurisdiction, Government of India

Answer: Indian locomotive class WAG-7
Indian locomotive class WAG-5