28.1 The successful bidder (or awarded bidder) is responsible for the performance of all inspections and tests for the supplies and equipment thereof, and shall apply equally to any work he may subcontract and to any supplies purchased by him for incorporation in the final product. Record of the examination and tests for each locomotive shall be kept complete and available to the SRT or its Inspecting Engineer (ร), and not less than 5 copies of them shall be forwarded to the SRT (Chief Mechanical Engineer) in Bangkok, Thailand for records. The SRT or its Inspecting Engineer reserves the right to perform any of the inspections or to ask the Maker to perform any test, which in his judgment is deemed necessary to assure that the work and quality of material used conform to the requirements in the specification and contract