Picture the rim of a Siberian open pit mine at dawn.
The hole below is so wide you could drop a small town into it.
Down on the floor, one yellow machine crawls toward the loading site.
It is the size of a three story building set on wheels.
Most people who see it never guess what it can do.
And almost no one guesses how it moves.
A machine too big for any road
The truck is a BelAZ 75710, built in Belarus.
It is the largest and heaviest mining haul truck ever made.
Empty, it already weighs about 360 tons.
Load it up, and the whole machine tips the scales at 810 tons.
Its payload alone is a staggering 450 tons of rock.
That is roughly the weight of 300 ordinary cars in a single load.
A truck this size can never legally drive on a public road.
So it is shipped in pieces and bolted together at the mine.
It stands more than twenty feet tall at the top of its box.
Nothing about it fits the scale of a normal road.
And all of it answers to a single driver, perched high in one cab.
Eight tires, each a monster
Look first at the wheels, and the scale hits you.
The truck rolls on eight massive tires.
Each one stands taller than a grown adult.
A single tire can carry about 100 tons of that load.
That is close to the weight of seventeen African elephants.
The rubber alone in one tire weighs several tons.
Two people could stand side by side inside a single tread.
These tires are custom built and brutally expensive.
Each one costs well over fifty thousand dollars.
A full set of eight runs into the hundreds of thousands.
Rough haul roads chew through them fast.
Every mine budgets for replacing them again and again.
Just keeping the truck rolling is a fortune in rubber, spent again and again.
The numbers that stop you cold
Everything about this machine runs to extremes.
Its two diesel engines together make around 4,600 horsepower.
They can drink well over a thousand liters of fuel an hour.
Yet the loaded truck still tops out near 40 miles per hour.
It sips almost nothing when idling, then gulps under a full load.
A single shift can burn through a small tanker of fuel.
Its brakes throw off enough heat to warm a house.
It is built to work in brutal cold and blistering heat alike.
Temperatures far below freezing to well above it are no problem.
The whole thing is engineered to run almost without a break.
Everything is oversized to survive the constant punishment.
But the strangest part is not the size or the fuel.
It is the way the power reaches the wheels, or rather, how it does not.
The truck with no gearbox
Here is the hidden system almost no one pictures.
A machine this heavy has no mechanical gearbox turning its wheels.
According to one report, its two diesel engines never touch the wheels at all.
Instead, each engine spins a large electric generator.
That electricity flows to four huge motors, one at each wheel.
Every motor puts out around 1,200 kilowatts of power.
There are no gears to shift and no clutch to slip.
Electric motors deliver their full force from a dead stop.
That is exactly what a loaded giant needs on a steep haul.
It is the same trick that moves a diesel electric train.
So the giant is really a rolling power plant.
Diesel makes the current, and electricity turns the wheels below.
Where the monster goes next
Trucks like this move the rock that builds the modern world.
They haul the coal, copper, and iron that everything depends on.
The diesel electric design is now spreading across the industry.
It lets engineers push machines to sizes a gearbox could never handle.
According to one account, the same electric drive powers many of the biggest haulers on Earth.
Newer versions are even learning to drive themselves.
Some big mines already run these giants with no one aboard.
The same drive to build at colossal scale reshapes the land, and life slips back in, from a solar farm fox to the seals near an offshore wind farm.
A driver who has piloted 810 tons never forgets the feeling.
The cab sits so high the world looks small below.
One truck can slowly move an entire mountain over its working life.
Stand at the rim and watch the giant crawl below.
It is one of the most electric machines you will ever see, hiding in plain sight.
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