The first service ran on July 15.
The services operate from Once station in Buenos Aires using CNR-built CKD 8G diesel locomotives and modern coaches supplied by CRRC. The services have Primera (second class) and Pullman (first class coaches) offering 276 seats plus a restaurant car.
Services operate twice a week with departures from Once on Mondays and Fridays, returning from Bragado early on Mondays and Tuesdays.
The trains also serve intermediate stations at Lujan and Mercedes as well as Suipacha and Chivilcoy.
An extra stop has been added at Mechita, where Russian firm Transmashholding has invested in rail maintenance facilities. Fares for the Once to Bragado journey are Pesos 155 ($US 3.65) for Primera class and Pesos 186 for Pullman class.
Residents and politicians from towns much further along the line through Bragado such as Pellegrini, which is nearly 500km from Buenos Aires, have requested the extension of passenger although no firm plans to do this currently exist.