The operation consists of the acquisition of between 22 and 32 vehicles of the Metro Ligeiro type to strengthen the fleet of Rolling Stock (MC) of Metro do Porto to meet the estimated demand projections for the new Rubi line (Casa da Música - Santo Ovídio), as well as to meet the growing demand in the rest of the Metro Network. In addition to the acquisition of the vehicles, the operation includes all contracts ancillary to the operationalization of the entry into service