San Francisco's Bay Area Rapid Transit has become the first transit system in the nation to provide wireless communications to passengers on its underground trains. Five of the Bay Area's six wireless companies have signed a deal to use the system, and the sixth is in negotiations, reported The San Francisco Chronicle. The deal with the phone companies for downtown San Francisco will generate a minimum of $408,000 a year. That amount could rise to more than $2 million with the wiring of additional stations and tunnels.