The newer technology, known as communication based train control (CBTC), is replacing a signal network that has been used to direct subway traffic since the 1930s. “This is complicated, difficult, not-all-good news,” Janno Lieber, MTA chairperson and CEO, said during the agency’s committee meetings. Transit officials said this week that signal upgrades to portions of several subway lines in Brooklyn, Queens and Manhattan have run into delays, significantly slowing the rollout of a more modern technology that is designed to make trains run faster and closer together. The MTA is suffering from signal distress on multiple subway lines, including a two-year delay for upgrades along an elevated section of the F and G in Brooklyn because a contractor manufactured parts in the wrong size.
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