Why Every Freight Car Still Has a Hand-Cranked Wheel

Every freight car in North America carries a steel wheel bolted to one end, connected by chains and gears to the brake shoes underneath. No electronics, no sensors, no software. A worker grabs it, cranks it clockwise, and the brakes lock. That is the entire system. But in an industry that tracks shipments by satellite and moves freight behind four-thousand-horsepower locomotives, this hand-cranked wheel isn't optional. It is federally mandated on every single freight car in the country. So why does a piece of technology that a Civil War veteran would recognize still ride on every train in America?