what are locomotives

When a lot of people picture a fire extinguisher, the picture that's called to mind belongs to a CO2 extinguisher. With their large, metals cylinders of bright red and hard horns, these fire extinguishers have been installed as an emergency measure in homes and businesses for generations. Carbon dioxide extinguishers could be differentiated from similar extinguishers through the lack of any kind of pressure gauge at the top of the tank. When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel.