China's subway has begun using carbon fiber train Wuhan metro passengers can now take advantage of a unique train whose carriages and main interior elements are made of carbon fiber, local press reports. This makes the train three tons lighter, making it more energy efficient than conventional trains.

China's subway has begun using carbon fiber train Wuhan metro passengers can now take advantage of a unique train whose carriages and main interior elements are made of carbon fiber, local press reports. This makes the train three tons lighter, making it more energy efficient than conventional trains.