Ferrocarriles subterráneos (Materias-Términos)

Chicago Transit Authority. Rail ("L") system map, 2021.

Chicago Transit Authority website, Sept. 12, 2022: more > agency overview (CTA service is provided by two modes: bus and rail; The 'L': Our rail system, known as "The 'L'", consists of train lines spanning the city and neighboring communities. The service provided is described as "heavy rail rapid transit," also referred to as a "subway" or "metro" in many parts of the world)

Merriam-Webster dictionary online, Sept. 12, 2022 (metro, noun, plural metros: subway sense b; subway, noun: an underground way: such as a) a passage under a street (as for pedestrians, power cables, or water or gas mains); b) a usually electric underground railway; c) underpass)

Dictionary.com, Sept. 12, 2022 : metro (noun, plural metros: 1. the underground electric railway of Paris, France, Montreal, Canada, Washington, D.C., and other cities. 2. subway (def. 1)) subway (noun: 1. Also called, especially British, tube, underground. an underground electric railroad, usually in a large city. 2. Chiefly British. a short tunnel or underground passageway for pedestrians, automobiles, etc.; underpass) tube (noun, def. 9: the tubular tunnel in which an underground railroad runs. 10: the railroad itself) underground (noun: def. 5: Chiefly British. a subway system)

Ibero, 12 junio 2024: catálogo electrónico (Ferrocarriles subterráneos)