In mid-September, the first shield machine "Polina", made by China Railway Construction Heavy Industry Group, was exported to Russia. While successfully completed the 200 meters driving trial tunneling required in the Moscow subway tunnel, the shield machine officially passed the final acceptance. This is the first of five shield machines independently developed and exported to Russia to challenge the world's extreme cold environment.

During trial tunneling, the service team provides professional and efficient technical support for the smooth operation of the equipment, carries on the high quality and comprehensive operation to the customer, maintains the training. The average completion rate of the equipment during trial excavation reaches 99%, which is highly recognized by customers.