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Types of locomotives
A diesel locomotive is a powered by a diesel engine. The diesel engine may drive the locomotive's wheels directly via a gearbox, shaft or chain (called mechanical transmission); by generating electricity which is in turn used to power the wheels (called diesel-electric); or by using a hydraulic transmission system (diesel-hydraulic). Diesel locomotives are extremely popular worldwide, due to their ease of use and reliability. They are more powerful than steam locomotives and do not need an expensive power grid like electric locomotives.
Steam locomotivewood, coal or oil (but mostly coal) to heat water in a boiler, which turns into steam which is used in pistons to power the train. Steam locomotives are not widely used any more due to their operational costs, especially the fuel costs; steam locomotives are now mostly only used on tourist railroads.
An electric locomotive is a locomotive that runs on electricity as the name suggests. Electric locomotives cost the least to operate, but it costs the most to build the track and provide electricity, making it only the second next used type, behind diesel locomotives.