Section 11(3) in The Chennai Metro Railway (Notices of Accidents and Inquiries thereto) Rules, 2014
(3)Departmental Inquiry: If any department of the Metro railway administration concerned accepts the responsibility of the accident, it shall be the duty of the Head of the department responsible for the accident to make an inquiry called 'Departmental Enquiry' as he may consider necessary. If his staff or the system of working is at fault, he shall adopt or suggest such measures as he may consider necessary for preventing a recurrence of similar accidents.
