STC to invest MXN800 million for preventive maintenance of Mexico City Metro Line 12 August 29, 2016 | Latin America Finance Sistema de Transporte Colectivo (STC), the government body responsible for the Mexico City Metro, has announced plans to invest MXN800 million for preventive maintenance of Line 12. The line spans 24 ... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password