The company said total freight carloads for last month were 72,820 versus 70,238 in June 2011.
Included in its June 2012 totals were 1855 carloads from acquisitions and on a "same railroad" basis, carloads rose 1%.
RailAmerica increased shipments in seven out of 12 of its commodity groups versus the same period last year, including agricultural products and motor vehicles.
Logging the biggest declines in June were coal and metallic ores and metals, with coal’s drops primarily due to lower shipments in the Midwest as well as the central and northeast regions.
The lower metallic ores and metals numbers were attributed to reduced shipments in the northeast.
RailAmerica operates a portfolio of 45 individual railroads with about 7500 track miles in 28 US states and three Canadian provinces.