Underground Exploitation Equipment In United States Of America

This list of metro systems includes electrified rapid transit train systems worldwide.In some parts of the world, metro systems are referred to as subways, u-bahnen or undergrounds.As of december 2017, 178 cities in 56 countries around the world host the approximately 180 metro systems that are listed here.The london underground first opened as an underground railway in 1863 and.

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