Net income rose to Reais 815.3m ($US 350.6m), an 8.8% increase over the corresponding period in 2012, with profits reaching Reais 155.6m.
CEO Mr Eduardo Parente says he expects the company's strong performance to continue in the fourth quarter.
MRS is investing Reais 1bn this year in infrastructure enhancements and new locomotives and rolling stock. The railway invested a total of Reais 638m between January and September.
