For the heavy maintenance workshop, Nanjing Metro Line 1 ordered a Nencki bogie test stand NBT Coach for testing of wheel load distribution, axle distance and parallelism measuring.

Nanjing Metro made a local tender and got five offers, from which Shenzhen Sunray Group, who was offering the technology from Nencki, has been selected. This will be first Nencki bogie test stand on the Chinese metro market.