CAT puts century-old train tech to work in its biggest underground machine yet

Diesel-electric locomotives have been barreling along America’s wide-open spaces for generations, and the century-old combination of highly efficient diesel engines spinning up generators to power high-torque electric motors has proven tough to beat. Now, Caterpillar is putting that century-old concept to work underground. Meet the CAT R3200 XE LHD.

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