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A train is a connected series of vehicles that move along a track (permanent way) to transport freight or passengers from one place to another. The track usually consists of two rails, but might also be a monorail or maglev guideway.
Propulsion for the train is provided by a separate locomotive, or from individual motors in self-propelled multiple units. Most modern trains are powered by diesel locomotives or by electricity supplied by overhead wires or additional rails, although
historically (from the early 19th century to the mid-20th century) the steam locomotive was the dominant form of locomotive power. Other sources of power (such as horses, rope or wire, gravity, pneumatics, and gas turbines) are possible. A passenger
train is one which includes passenger-carrying vehicles. It may be a self-powered multiple unit or railcar, or else a combination of one or more locomotives and one or more unpowered trailers known as coaches, cars or carriages. Passenger trains travel
between stations where passengers may join or leave the train. Many of the more prestigious passenger train services have been given a specific name, some of which have become famous in literature and fiction. India has the largest passenger density in
the world.[citation needed]India has one of the largest passenger density due to a great population, referring to a population chart of India, yet it is only one of the most populated countries, but is the only populated one to have the greatest passenger
density out of the other countries. Some passenger trains, both long distance and short distanced, may use double-decker railcars to hold more passengers per car. Designs and safety of passenger trains has changed dramatically over time.
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