China has built the world's most powerful hydrogen-powered locomotive. It could replace trains that use fossil fuels.
The "Ningdong", China's first hydrogen locomotive converted from a normal engine, rolled out of the factory on Thursday.
Liang Zhenzhong, chief engineer, says the hydrogen-powered train could run continuously for up to 190 hours.
He says the locomotive has a hydrogen storage system that could be refilled in two hours. It is also cheaper to operate.
"Hydrogen is a clean, renewable energy. The operating costs of hydrogen-powered locomotives are half those of normal ones," he says.
Unlike fossil fuels, hydrogen does not produce harmful air pollution or greenhouse gases.
