Peru has long boasted the world’s highest railroad. Now it is claiming one of the cleanest. Ferrocarril Central Andino since 1999 has operated the formerly state-owned rail line that runs from Lima over the Central Andes, reaching an altitude of nearly 16,000 feet (4,900 meters). It recently unveiled a locomotive that has been converted to a dual-fuel system of diesel and compressed natural gas (CNG). By using natural gas from the Camisea field in southern Peru, the company will be able to reduce air pollution from its locomotives—eight will be converted in all—by up to 70%, says Jack Roberson, the railroad’s executive director. The rail line’s consumption of diesel fuel, currently about 3 million gallons a year, will fall precipitously, he... [Log in to read more]