How massive locomotives move using only smooth, rigid surfaces
Modern diesel freight locomotives can generate over 50 tons of forward force, yet they lack the rubber tires we rely on for grip. This video explores the physics of how immense power is transferred through tiny contact patches between steel and rail.
The engineering feat of rail transport lies in the concept of tractive effort. Despite the appearance of 'slick on slick' contact between smooth metal surfaces, a single modern diesel freight locomotive is capable of delivering upwards of 50 tons of forward force into the rails.
This massive transfer of energy occurs through incredibly small contact patches, demonstrating the surprising role friction plays in the interaction between vehicles and the rail system.
Source: Why Locomotives Don't Have Tires
