Officials feared the brackish storm water that poured into tunnels could corrode vulnerable signal and switching systems, complicating the task of reopening a bus and rail system that ferries 8.5 million passengers on a typical workday.

WSJ: Superstorm Sandy Cuts Wide Swath of Damage

That's because the city has equipped three bus routes with wireless technology that can pull off a trick every commuter has dreamed of: switching a red light to green on command.

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