This document proposes the creation of CATALOGUE, a global open data platform for transportation data. CATALOGUE would allow anyone to upload, access, and share open transportation data. It aims to provide a single location for accurate, up-to-date open transportation data through features like data validation, error checking, categorization, and real-time updates. CATALOGUE would be run by a non-profit foundation and open community to ensure open governance and access to its aggregation of worldwide transportation data and tools.