June 06, 2012

Stadler and MRS Logistics unveil rack locomotive

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STADLER and MRS Logistics, Brazil, have unveiled what they say is the largest rack and pinion locomotive ever to be built.

MRS ordered seven of the electric locomotives from Stadler in 2010 in a $US 55.9m contract with the first two set to be delivere d to Brazil via Basle and Antwerp over the next few weeks.

The 5MW, four-axle locomotives are 19m long and have a 760kN starting tractive effort. They have two bogies which in turn each have two pinion transmission systems that will engage with the trip-lamella Abt rack on 10km-long ramp on the 1600mm-gauge freight line from São Paulo to the Port of Santos. Two of the locomotives operating in multiple will be able to haul a 850-tonne freight train on the 10.4% incline, making them 50% more powerful than those already in use.

Around 25% of the traction required as the train goes uphill is supplied by two separate adhesion transmission systems. Energy savings are also expected on the 3kV DC electrified line through regenerative braking.

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