Moscow Metro in the context of "Urban rail transit in China"

The Kyiv Metro is a rapid transit system in Kyiv, Ukraine, owned by the Kyiv City Council and operated by the city-owned company Kyivskyi Metropoliten. It was initially opened on 6 November 1960, as a single 5.24 km (3.26 mi) line with five stations. It was the first rapid transit system in Ukraine, and the third in the former Soviet Union, after the Moscow Metro and Leningrad Metro.

Today, the system consists of three lines and 52 stations, located throughout Kyiv's ten raion (districts), and operates 69.6 kilometers (43.2 mi) of routes, with 67.6 km (42.00 mi) used for revenue service and 2.048 km (1.27 mi) for non-revenue service. At 105.5 m (346 ft 1.5 in) below ground level, Arsenalna station on the Sviatoshynsko-Brovarska Line is the second deepest metro station in the world after Hongyancun station in Chongqing, China.

The Nizhny Novgorod Metro (Russian: Нижегородское метро), formerly known as the Gorky Metro (Russian: Горьковское метро), is a rapid-transit system which serves the city of Nizhny Novgorod, Russia. Opened in 1985, it consists of 15 stations and is 21.6 kilometres (13.4 mi) long. The metro connects with the City Rail and Nizhny Novgorod Central Diameters systems at the Moskovskaya station. It has the third-largest number of stations of any Russian subway system, the largest two being Moscow and St. Petersburg.

The Madrid Metro (Spanish: Metro de Madrid) is a rapid transit system serving the Spanish capital city of Madrid and its surrounding metro area. First opened in 1919, the system has regularly undergone numerous extensions over the next century, bringing it to today's network which comprises thirteen "conventional" (heavy-rail) lines and three light-rail lines known as Metro Ligero. The network is largely owned and operated by Metro de Madrid S.A., a public company owned by the Government of the Community of Madrid.

As of September 2025, the conventional lines have a combined length of 296.6 kilometres (184.3 mi), making Madrid's Metro system the 20th longest rapid transit system in the world, the 6th longest in the world outside of China, and the 3rd longest in Europe behind only the Moscow Metro and the London Underground; the three light-rail lines add a further 27.8 kilometres (17.3 mi) to the total length of the network. The whole system transported a total of 715 million passengers in 2024 – in this metric Madrid's system stands as the 29th most-used in the world and the 5th most-used in Europe, behind Moscow, Paris, London and Istanbul.