マドリードの地下鉄は何年にできましたか？
The first phase of construction was finished in 1919. It was constructed in a narrow section and the stations had platforms. The enlargement of this line and the construction of two others followed shortly after 1919. The Madrid metro was inaugurated on 17 October 1919 by King Alfonso. At the time of inauguration, the metro had just one line, which ran for between Puerta del Sol and Cuatro Caminos, with eight stops.
1919