The 20km/h six-car trains will be delivered betwen February and July next year in readiness for the launch of passenger services on September 2.
The 54km Ring Line will have 30 stations including 15 interchanges with the Moscow metro network and nine interchanges with radial mainline services.
Thirty trains will be required to operate the peak service with five maintenance spares.
The trains will be equipped with passenger Wi-Fi, air-conditioning, CCTV, and storage areas for bicycles.
