
Bochumer Eisenhütte GmbH & Co. KG

GHH Fahrzeuge GmbHNordrhein-Westfalen, Germany

ALWAG Tunnelausbau GesmbH

Shenzhen Zhongtieerju Engineering Co. Ltd.

Eiffage Infra-Nordwest GmbH

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

China Railway 19th Bureau Group 2nd Co., Ltd.

Nippon COMSYS Corp.Tokyo-to, Japan

ESCO Consultant & Engineers Co., Ltd.

Wayss & Freytag Ingenieurbau AG

Hitachi Construction Co. Ltd.

China Railway Construction Heavy Industry Corp. Ltd.