Editing Subway

'''Subway''' is a term that refers to a type of [[rapid transit]] system that operates underground. It is also known as a metro, underground, or tube. The first subway system was built in [[London]], England, and was known as the [[London Underground]]. Since then, subway systems have been built in many major cities around the world, providing a fast and efficient means of transportation for millions of people every day.

== History ==

The concept of a subway system dates back to the 19th century. The first subway line was opened in London in 1863, and was known as the [[Metropolitan Railway]]. This was followed by the opening of the [[New York City Subway]] in 1904, and the [[Paris Metro]] in 1900. These early systems were built using a combination of cut-and-cover and tunneling techniques.

== Design and Construction ==

Subway systems are typically designed to be high-capacity, with trains running on dedicated tracks separate from other traffic. Stations are usually located at regular intervals along the line, and are often integrated with other forms of public transportation, such as buses and trams.

Construction of a subway system involves digging tunnels, building stations, and laying track. This can be a complex and expensive process, particularly in densely populated urban areas. Modern subway systems often use [[tunnel boring machines]] to dig the tunnels, which can be faster and less disruptive than traditional methods.

== Operation ==

Subway systems are typically operated by a public transportation authority, which is responsible for maintaining the infrastructure, operating the trains, and setting fares. Many subway systems use automated ticketing systems, with passengers purchasing tickets or passes before entering the system.

== Impact ==

Subway systems have a significant impact on the cities in which they operate. They can reduce traffic congestion, improve air quality, and promote economic development. However, they can also be expensive to build and maintain, and can cause disruption during construction.

== See Also ==

* [[Rapid transit]]
* [[Public transportation]]
* [[Tunnel boring machine]]

[[Category:Transportation]]
[[Category:Infrastructure]]
[[Category:Urban planning]]
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