Air Products, the company installing the fuel station, is working with Transport for London (TfL) to build fuel stations for a fleet of 70 Hydrogen-powered vehicles that are being introduced next year. TfL vehicles will contain a mixture of buses, vans, cars and motorcycles and will be used by TfL staff, the police and the fire brigade. The five-year trial of both fuel cells and Hydrogen combustion engines will cost around $43 million (£22 million).
A fuel cell combines Hydrogen from a tank with oxygen from the air to produce electricity, which powers an electric motor. The only byproduct is water and the whole process produces no carbon dioxide emissionshttp://driving.timesonline.co.uk/tol/life_and_style/driving/article3753961.ece