Rather than using fossil fuels, these trains are propelled by varying shifts in the horizontal magnetic fields that alternately attract and repel along the rails.

Maglev (Magnetic Levitation) trains do not use fossil fuels directly for propulsion, as they are powered entirely by electricity through massive electromagnets in the track and the vehicle. However, their "indirect" carbon footprint depends entirely on how the local power grid generates that electricity. In 2026, a maglev running in a region powered by coal or natural gas is still indirectly reliant on fossil fuels, whereas one in a region with high nuclear, wind, or solar capacity would be nearly carbon-neutral. From a mechanical standpoint, maglevs are significantly more energy-efficient than traditional high-speed rail because they eliminate rolling friction (no wheels on rails), meaning they require less power to maintain high speeds. Proponents argue that maglevs are the "greenest" future for intercity travel because they can easily transition to 100% renewable energy as the grid decabonizes, unlike commercial aviation which remains tethered to liquid kerosene fuels. Thus, while the train itself is "zero-emission" at the point of use, its total environmental impact remains a reflection of the source of the electrical current.