CTA deploys 4G wireless service on subway system November 20, 2015 | North America News Chicago Transit Authority (CTA) has deployed 4G wireless services on subway stations and tunnels of total length 35.4 km (22 miles) on the Blue and Red metro rail lines. The USD32.5-million 4G wireles... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password