It was initially inaugurated in 1863 with steam engines, and electric trains began running in 1890.
In 1892, it first went into service. The 165-kilometer-long network is available around the clock.
This is one of the few metro systems with additional lines beyond the initial route, running along a 10.5-kilometre underground loop.
In 1896, Line 1 of it went into service. There are 52 stations in the network.
Initiation of the first line took place in July 1900. The system currently has 16 lines, totaling 214km of network. The underground portion of this network totals 197 kilometers.
150 kilometers of the network's 175 stations are spread around the city. In the Second World War, it served as a bunker.
The New York City subway system has the most stations in the world with 420 stops spread across a 380-kilometer network. It began in 1904.
With the installation of lines for steam locomotive service, it started operating in 1869. Later, in 1904, subsurface railways underwent modification.
The Southern Pennsylvania Transportation Authority (SEPTA) in Philadelphia, United States, runs it. It began in 1907.