Supercemento completes electrification on Buenos Aires-Quilmes section of Roca commuter network December 9, 2015 | Latin America News Argentina-based Supercemento S.A has completed electrification on the Buenos Aires to Quilmes section of the Roca commuter network in Buenos Aires. The electrification is part of the programme to elec... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password