Qingdao Sifang has supplied 225 vehicles for the Sarmiento Line and 180 cars for the Mitre Line and 304 vehicles for the General Roca lines under a contract signed in 2013.

The first sets entered service last July on the Sarmiento Line, replacing life-expired trains that were more than 50 years old.

The trains have been delivered to Argentina in 24 separate batches over the last 19 months.