Systra to advise STC for Mexico Metro Line 12 refurbishment with open service November 2, 2015 | Latin America News France-based Systra Consulting has concluded a study for Sistema de Transporte Colectivo (STC) to recommend works required to complete the refurbishment of the Mixcoac-Atlalilco tunnel section on... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password