An amended turnkey agreement was later signed on September 16, 1997, with a consortium of companies (including Mitsubishi Heavy Industries and Sumitomo Corporation). A separate agreement was signed with ČKD Dopravní Systémy (ČKD Tatra, now part of Siemens AG), the leading builder of trams and light rail vehicles for the Eastern Bloc, on rolling stock.
A revised contract was finalized on September 16, 1997, involving a consortium of companies including Mitsubishi Heavy Industries and Sumitomo Corporation. A separate agreement was also signed with ČKD Dopravní Systémy (ČKD Tatra, now part of Siemens AG), the leading manufacturer of trams and light rail vehicles for the Eastern Bloc, concerning rolling stock.