[aerohead]

I looked at some mining equipment:
*JP Morgan-Seimens-Caterpillar have an all-electric,Utility grid-powered open-pit mining dragline excavating machine,which uses gearless direct drive AC motors for the hoist and drag cable drums.If renewably-sourced electric power is provided,then it's zero-carbon.That was easy.
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*Caterpillar makes a 994F wheel loader,used in open pit mining.It's diesel-hydraulic for the rams,plus has a transmission and two differentials.
*An electric motor of equal power could substitute for the engine and run all functions.
Or,hub-motors with planetary sets could replace the differentials, you could skip the transmission, and perhaps,linear motors could take the place of the hydraulic rams,or run a smaller motor just to handle the hydraulic pump/rams.
This machine has some of the largest wheels in the world.They could become batteries themselves perhaps,for a pure BEV,or perhaps an escorting battery tender could accompany the loader as it cycles between the drag line shovel and dump trucks.
*Currently,these loaders consume on the order of 990-gallons diesel/day.
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*The Liebherr T282 dump truck hauls the pay up out of the pit to the rail car-loading conveyor.
*They're diesel-electric,so like a diesel locomotive,it's a matter of skipping the diesel engine,and provide electric power directly to the vehicle.
*Like the loaders,the dump truck has enormous wheels/tires,and again,there's potential for the tires to become 4-massive battery packs.
*Or as above,a battery pack-bearing tender,with umbilical,could accompany the truck.
*With a curb weight of 522,000-pounds,the truck would be capable of regen,during descent back down into the pit with each loading cycle,capturing back some of the kinetic energy currently lost on every trip with the diesel engine,perhaps reducing the pack size,or tender size/capacity.
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*If the conveyor belt system which loads the rail cars isn't already electrically-powered,there's no reason that it couldn't be.
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*And the railroad train is already 'hybrid' electric.Lose the parallel diesel-generator and go to a caternary line to bring in renewably-generated electric power and you've got a zero-carbon train.
*Presently,between BNSF,CSX,and Union-Pacific,that would cut on the order of 379,766,156-tons carbon dioxide/year.