Through the JST/Belmont Forum international joint research project 'Global Initiative for Sustainable Urbanization: Food, Energy and Water Nexus/Movable Nexus: Innovation in Urban Food, Energy and Water Management (M-NEX) (2018-2022)', we have developed a design support platform M-NEX for urban decarbonisation and  sustainability through the lens of food, energy and water nexus. The platform is emerging as multi-disciplinary and inter-sectoral tools for urban redevelopment and management led by railway companies and developers.