
ESCO Consultant & Engineers Co., Ltd.

Hitachi Construction Co. Ltd.

China Railway 16th Bureau Group the 5th Engineering Co., Ltd.

Nippon COMSYS Corp.Tokyo-to, Japan

ALWAG Tunnelausbau GesmbH

GHH Fahrzeuge GmbHNordrhein-Westfalen, Germany

Shenzhen Zhongtieerju Engineering Co. Ltd.

Bochumer Eisenhütte GmbH & Co. KG

Wayss & Freytag Ingenieurbau AG

Kiuchi Construction Co., Ltd.

China Railway Construction Heavy Industry Corp. Ltd.

Eiffage Infra-Nordwest GmbH