Kolkata Metro Railway will start services from 4 am on Sunday, nearly five hours before the normal schedule, on its three corridors to help people attend the International Day of Yoga celebration at Red Road, officials said. Additional services have also been planned, keeping in mind the large turnout expected at the Yoga Day event and the transportation needs of NEET-UG aspirants and their guardians. The timings of the last Metro services from terminal stations will remain unchanged.