Are you sure it is ISO certified? The way you have described, it appears that the ISO certification may have been withdrawn. If my knowledge is right there are two ISO certifications 2000 and 2008 which apply to IR. I think those which were certified under ISO 2000 may not have been certified under ISO 2008. There has been a previous discussion on ISO in IRI: /faq/post/407
. I accessed this website in google which mentions just 13 trains are ISO 2008 certified: click here
. I dont know how reliable this website is.