An update recently applied to the Zetron Series 4000 dispatch system used by the CPTM commuter rail system in the state of Sao Paulo, Brazil, has added new capacity and functionality to the system. It has also enabled CPTM to utilize a new P25 network, and helped them meet the country’s new narrowbanding requirements. The state of São Paulo, Brazil, is the major industrial and economic powerhouse of the Brazilian economy and the richest s

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