In 1933 a third company, the Hispano-Argentina Company of Public Works and Finances (Compañía Hispano–Argentina de Obras Públicas y Finanzas (CHADOPYF), in Spanish) began construction of the other Underground lines.
Tahun 1933, Hispano-Argentina Society of Public Works and Finance (Hispano–Argentina de Obras Públicas y Finanzas (CHADOPYF), dalam bahsa Spanyol) memulai pembangunan jalur bawah tanah yang lain.