The Dearman Engine Company is making clean engines a reality with a piston engine powered by the expansion of liquid air (nitrogen). The engine could significantly reduce the emissions of refrigerated transport, buses and commercial vehicles, and help companies to make substantial fuel savings. Fitting just a third of the UK's refrigerated trailer fleet with a Dearman engine could remove 180 tonnes of particulate matter from the air annually, the equivalent of taking 367,000 Euro VI diesel lorries off the road. Similarly, the Centre for Low Carbon Futures estimates that by 2025, liquid air vehicles could save a million tonnes of carbon and 1.3bn litres of diesel in the UK alone. Dearman is on track to install its first engine on a vehicle by summer 2014 and is on the road to bringing its product to market. It is also developing a heat-hybrid engine that could reduce diesel consumption on a bus by 25%.