Train

A **train** (or **rail train**) is a set of railway cars (also called vehicles)  that are tied together with or without a locomotive. Trains are used to carry people, and also things like raw material, finished goods, cargo, and waste. The vehicles that carry freight are called *cars* (in the United States) or *wagons* (in the United Kingdom). The ones that carry passengers are often called coaches or carriages. A place where a train stops to let people get on and off is called a train station or railway station.

Trains have their roots in wagonways, which used railway tracks and were powered by horses or pulled by cables. Following the invention of the steam locomotive in the United Kingdom in 1804, trains rapidly spread around the world, allowing freight and passengers to move over land faster and cheaper than ever possible before. Rapid transit and trams were first built in the late 19th century to transport large numbers of people in and around cities. Beginning in the 1920s, and accelerating following World War II, diesel and electric locomotives replaced steam as the means of motive power. Following the development of cars, trucks, and extensive networks of highways which offered greater mobility, as well as faster airplanes, trains declined in importance and market share, and many rail lines were abandoned. The spread of buses led to the closure of many rapid transit and tram systems during this time as well.

## History
Before steam trains there were *wagonways* where horses and people pulled cars over tracks made of stone and wood.

A steam train made its first journey on 21 February 1804 at the Penydarren Iron Works in Merthyr Tydfil, Wales, UK.  The  locomotive *Coalbrookdale* was built by *Richard Trevithick* helped by the owner of the ironworks Samual Homfray. The Liverpool and Manchester Railway in 1830 was the first to run passenger trains and freight trains in the way that trains run on most railways today. The use of trains were then to go from country to country over the world, and it was more easy for people and things to get from one place to another place.

As the internal combustion engines that used petroleum oil or diesel oil got better, people tried to use those, but they were not very successful at first. The year 1913 in Sweden was when the first successful run in the world, and it was able to keep going until 1939.  The 1920s saw the diesel trains getting better, and by the 1930s, the diesel trains were going very fast, including a German train going from Berlin to Hamburg at over , and a train going from Denver to Chicago,  without stopping at an end-to-end speed of .

While the first small railway run by electricity was in 1835, it was about after the 1890s when more electric railways and trains started across the world.

After World War 1, there were improvements in road cars and buses, and people began to use them more than trains.  The same was true for how things were moved. such as the Finnish Inter-City cars.

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The world's longest passenger train was  long and had 100 cars.  It was a special train that ran in October 2022 in Switzerland.

#### Trains in the city 
To get to a city and to move around it trains may need to carry many people and they can get very busy. There are many names for this type of train including *rapid transit*.  The railway for these trains may go underground or be above the road. A new word for trams that also use tracks used by other trains outside the city is tram-trains.

#### Trains that go far
There are few long-distance passenger trains in the United States, but more in Europe and Asia.

They may have a special car where you can eat. Sometimes there are also sleeping cars (passenger cars with beds) for long overnight voyages.

#### Very fast trains
High-speed rail uses special, fast passenger trains on special tracks. A few of the fast ones are maglev trains, using magnets to hover slightly off the tracks to have less friction.

## Crew 
* The **driver** or **engineer** makes sure the train works right, and speeds it up or slows it down. Usually a train needs a driver to make it run well, but a few are run by computer.
* The **guard** or **conductor** makes sure the train goes the right way and tells the driver if he makes a mistake.
* Only steam trains have a *fireman*. He makes sure the fire that powers the steam locomotive is burning properly by putting coal into the fire.

## Propulsion 
Most trains are pulled by locomotives. Before 1900, almost all were steam locomotives. As this kind of steam engine uses very much fuel for the work it does, steam began to give way to diesel locomotives and electric locomotives during the 1930s. Today, most locomotives are diesel-electric locomotives.

Sometimes a train has no separate locomotive, but the prime mover (diesel engine or electric motor) is located on the first car of the train itself, and the car has engineer's cabin. The car is called a "motor unit". Some trains have motors in many or all of the cars. This is called a diesel multiple unit or electric multiple unit. Usually, both ends of the train have engineer's cabins. These trains are especially popular in commuter traffic in large towns and cities. Electric trains get their power from a third rail or from overhead wires.

The fastest train in the world is a special type of train using maglev propulsion, and it can reach .

## Notes 
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