The first pair of next-generation rail cars built by the CRRC， the worlds largest producer of rail transit equipment， in its North American factory in Springfi eld City， Massachusetts. The CRRC said on December 18 that it has completed the production of the subway cars to be delivered to Massachusetts. The subway trains will replace the cars serving the Orange Line of Boston for decades.

The CRRC is manufacturing 404 subway vehicles for Massachusetts， including 152 for the Orange Line and 252 for the Red Line.