Earlier in June, Westport also teamed up with Caterpillar to build engines for mining trucks and locomotives that use cheaper natural gas rather than diesel. Natural gas is not only cheaper to purchase but it also pollutes less than either gasoline or diesel fuel. It makes less nitrogen oxides, particulate matter and greenhouse gases.
Natural gas engines, such as the one in the Compressed Natural Gas (CNG) Ram pickup, are sometimes supplemented by smaller gasoline tanks, with the engines capable of running on either. Finding CNG could also prove troublesome, as only about 1,500 fuel stations offer it.
