FSSAI has released a letter dated 23.12.2020 to inform the launch of FoSCoS for Indian Railways w.e.f Jan 1st, 2021 and closure of existing FLRS w.e.f Dec 29th, 2020. All resource materials required for smooth migration from the FLRS system to FoSCoS has been provided in the home page of FoSCoS. For more information read here.