In 2009, MTR Hongkong-CRRC  Changchun  project,  MTR is very strict on the surface of the car body  and stop the production  because of the "unqualified"  materials  for surface carbody.  Cadidar  worked  together with Thyssenkrupp  to  provide all  of documents  and  samples required by  MTR . MTR is satisfied after good communication together.