Trains are remarkably efficient primarily due to low rolling resistance and superior aerodynamics. Because steel wheels run on steel rails, there is very little friction compared to rubber tires on asphalt, allowing a train to move massive amounts of weight with relatively little energy. Furthermore, trains benefit from the "platoon" effect: once the locomotive "punches a hole" in the air, every following car travels in that same aerodynamic wake, drastically reducing wind resistance per passenger or per ton of cargo. In 2026, many trains are also electric, which allows them to utilize "regenerative braking" to capture energy during stops and feed it back into the grid. From a capacity standpoint, a single train can carry hundreds of people or the equivalent of 280 trucks, which reduces the overall energy "footprint" per person-kilometer. While planes are faster, they require massive amounts of energy to fight "lift-induced drag" and stay airborne, making the ground-based, low-friction rail system the world's most energy-efficient form of mass transportation.