in the metropolitan sector of the city of buenos aires the roca line operates from the city-centre terminus of estación constitución south to alejandro korn, cañuelas, and la plata, and west to haedo. the line has the highest ridership figures in the buenos aires commuter rail network, and there is an ongoing electrification initiative to electrify the remaining parts of the line which are still operate diesel services, such as from buenos aires to la plata. new rolling stock from csr corporation limited has also been acquired for these services, and these began to be integrated into the line in june 2015.