CHENNAI: Chennai Metro Rail Limited (CMRL) will phase out its existing travel cards and migrate entirely to the Singara Chennai National Common Mobility Card (NCMC) from August 1.From that date, top-up services for the older CMRL travel cards will be discontinued across all 41 metro stations. Other ticketing methods such as QR tickets will remain unchanged.Commuters holding the old CMRL cards can continue using their cards until the balance is exhausted. Once the residual value falls below Rs 50, passengers must surrender the card at any metro station counter. They will then receive a Singara Chennai Card free of charge, with the remaining balance and deposit amount transferred to the new NCMC card for continued use.CMRL first introduced the NCMC-compliant Singara Chennai Card on April 14, 2023, alongside the older CMRL travel cards. The transition is aimed at creating a unified ticketing system compatible with multiple modes of transport and urban mobility services.