The first CSX rail cars travel under the S.R. 25 overpass on newly installed track linking Garden City Terminal’s Chatham and Mason Mega Rail yards. The Mason Mega Rail project is now more than 75 percent complete. (Georgia Ports Authority / Emily Goldman) SAVANNAH, Ga., Nov. 30, 2020 – On the heels of achieving its busiest month on record for both container trade and Roll-on/Roll-off cargo, the Georgia Ports Authority has reached a major milestone on its Mason Mega Rail Terminal.