Nobody Could Move Dirt Fast Enough — Then Caterpillar Built the Twin-Engine 657 Scraper

Nobody could move dirt fast enough for the massive highways, dams, and canals of the 1960s. Caterpillar’s answer was the *657 Scraper* — a 44-cubic-yard earthmover powered by **two separate diesel engines producing 785 combined horsepower**, with one engine pulling from the front and another driving from the rear. But raw horsepower wasn’t enough. The 657 suffered from high-speed “loping,” gained a redesigned cushion hitch, evolved into the more powerful *657B**, and eventually became part of Caterpillar’s remarkable **push-pull system**, where two scrapers could temporarily couple together and put roughly **1,900 horsepower* into the ground during the hardest part of loading. In this video, we follow the complete story of the Caterpillar 657 — the earthmoving arms race that created it, the engineering problems Caterpillar had to overcome, the enormous projects these machines were designed for, and why the same twin-engine principle survives more than sixty years later. Today’s 657 still carries the same *44-cubic-yard heaped bowl* as the original 1962 machine, but now produces more than 1,100 combined horsepower. If you enjoy stories about the enormous machines that built the modern world, subscribe for more. #Caterpillar #CAT657 #HeavyEquipment #Earthmoving #ConstructionHistory #IndustrialHistory #Scraper