Metro de Madrid is the metropolitan railway network of the Spanish city of Madrid and its metropolitan area. It was inaugurated on October 17, 1919 by King Alfonso XIII. It is the most extensive metro network in Spain, with 294 kilometers in 2019.
With a total of 302 stations it is the third in Europe by kilometers, after those of London and Moscow. In 2018, there were 657.21 million displacements. The Madrid metro network is made up of 12 conventional lines and the branch that connects Ópera and Príncipe Pío. In addition, there are three light rail lines totaling 27.78 km and have 38 stations. SACI participated with the supply of AHM1 Network Analyzers and current transformers.