The documents of public procurement procedures, that must be published by GYSEV Zrt., can be found on the websites of the Public Procurement Authority at https://kba.kozbeszerzes.hu/apex/f?p=103:35:708443210272944 and https://kereso-core.kozbeszerzes.hu/ or at https://ekr.gov.hu/portal/kezdolap operated by NEKSZT Kft.