Section 17(13)(ii) in The Railways (Opening for Public Carriage of Passengers) Rules, 2000
(ii)the responsible officer of the concerned railway has certified that the condition of the material and workmanship are such that the use of the girder for the specified loading shall not involve stresses in excess of those permitted in the IRS Steel Bridge Code,1962, provided that this sub-rule shall not apply to welded girders.