CSR SDD7

The CSR SDD7 is a diesel-electric locomotive of 2,249 horsepower built by CSR Corporation Limited from 2013 for Trenes Argentinos, the Argentine state passenger operator. Twenty-four of them are in use, and they make up the entire rolling stock of the San Martín Line in Buenos Aires Province. Each locomotive has a driving cab at both ends joined by an internal corridor. A Caterpillar 3516B engine delivering 1678 kW feeds an independent traction motor on every axle, controlled by two microprocessors, for a maximum speed of 120 km/h. The locomotive weighs 114 tonnes, with no more than 19 tonnes on any axle, and carries 6000 litres of fuel, 420 kg of lubricants, 800 litres of water and 400 kg of sand. Electrification of the line was under consideration in 2015, which would move the locomotives elsewhere, and in 2018 Transmashholding Argentina was awarded a contract to refurbish and update them and their carriages.