freight train west of Chicago in 1992.]], Norway]] in India has the largest passenger density in the world]] at Mclver, Perth, Western Australia]] DMU]] 500 Series (High-speed rail)]]]] electric locomotive used in passenger train service.]] In rail transport, a train is a series of rail vehicles that move along guides to transport freight or passengers from one place to another. The guideway (permanent way) usually consists of conventional rail tracks, but might also be monorail or maglev. Propulsion for the train is provided by a separate locomotive, or from individual motors in self-propelled multiple units. Most trains are powered by diesel engines or by electricity supplied by trackside systems. Historically the steam engine was the dominant form of locomotive power through the mid-20th century, but other sources of power (such as horses, rope, wire, gravity, pneumatics, or gas turbines) are possible. In American railway terminology, the term

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