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The Chicago Transit Authority (CTA) board recently approved spending $1.5 million to increase the number of rail station and emergency response vehicles equipped with a mobile security network. The authority is testing the network under a six-month pilot program that began in December.

The system sends live images from rail stations and buses via a fiber-optic network or wireless transmitter to laptops in vehicles and CTA’s control center. The authority will install antennas at another 39 stations and garages, and add antennas and laptops to another 20 vehicles.

“Expanding the number of vehicles and facilities participating in the pilot allows CTA to gather more data in order to evaluate the feasibility of using the mobile security network system-wide,” said CTA Chairman Carole Brown in a prepared statement.