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Automatic trains are designed, built, and operated using aerospace and computer technology. It have been developed in a few metropolitan areas, including a section of the London subway system, the Victoria Line (completed 1971). The first rapid-transit system to be designed for completely automatic operation is BART (Bay Area Rapid Transit) in the San Francisco Bay area, completed in 1976.

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Subway, also called metro or underground,  was inspired from the development of the trains. It is an underground railway system which could transport large amount of passengers.

Rapid Transit is a type of a passenger system that is used in urban areas, providing the fast and frequent travel for high capacity of passengers. Because of the need to be grade separated from the other type of traffics, rapid transit systems are usually located in underground tunnels, elevated viaducts, or separated ground level tracks that cannot interact with the rest of the street traffic.

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Subway have helped

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Many other cities followed London’s lead. In Budapest, a 2.5-mile (4km) electric subway was opened in 1896, using single cars with trolley poles; it was the first subway on the European continent.
In Paris, the Métro was started in 1898, and the first 6.25 miles (10 km) were opened in 1900.

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Air-conditioned trains with lightweight aluminum cars, smoother and faster rides due to refinements in track construction and car-support systems, and attention to the architectural appearance of and passenger safety in underground stations are other features of modern subway construction.

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The first urban underground railway was the Metropolitan Railway, which began operations on January 10, 1863. It was built largely in shallow cut and cover tunnels. It was worked by steam trains and despite the creation of numerous vents, was unhealthy and uncomfortable for passengers and operating staff.

This line was opened using steam locomotives that burned coke and, later, coal; despite sulfurous fumes, the line was a success from its opening, carrying 9,500,000 passengers in the first year of its existence.

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Subway

"Subway." Encyclopedia Britannica, 2018, https://www.britannica.com/technology/