Railroads Trusted Cast-Iron To Stop 15,000 Tons — It Shattered Like Glass At 60 MPH скачать в хорошем качестве

Railroads Trusted Cast-Iron To Stop 15,000 Tons — It Shattered Like Glass At 60 MPH

Railroads trusted cast-iron wheels to stop 15,000 tons of freight. But under the brutal heat of mountain braking, that solid iron shattered like glass at 60 miles per hour. Before the era of modern forged steel, American freight trains rolled on cheap, chilled cast-iron wheels. When a massive mega-train descended a mountain grade, the engineer relied on heavy brake shoes to fight gravity. This created a brutal war of friction. If the brakes dragged too long, the massive 1,000-pound wheels absorbed massive amounts of thermal energy. They literally glowed neon orange. The outside of the wheel expanded from the 1,500-degree heat. The inside hub stayed completely cold. This thermal gradient created terrifying internal stress. The metal reached its physical breaking point. The cast-iron wheel did not just crack. It violently detonated like a fragmentation grenade. This is the forensic documentary of why the railroad industry was forced to outlaw the cast-iron wheel. Witness the terrifying physics of thermal expansion. See the catastrophic kinetic destruction that happens when a loaded train loses its wheels halfway down a mountain.