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Section 28: Communication between passengers and metro railway officials in charge of trains
The metro railway administration shall provide and maintain in proper order, in any metro train, such efficient means of communication between the passengers and the metro railway official in charge of the train as may be approved by the Central Government.
Source: official text of The Metro Railways (Operation and Maintenance) Act, 2002 as published on India Code (PDF). All sections of the Metro Railways (Operation and Maintenance) Act, 2002.