Drawing upon a case study of regional transit in Denver, Colorado, this paper describes and accounts for the emergence of the global infrastructure public-private partnership (GIP3) as a novel extra-territorial mechanism for financing and delivering transportation infrastructure projects across large metropolitan regions in the United States (US). Unlike traditional locally-funded public-private partnerships, a GIP3 involves a global (i.e. extra-territorial) consortium of private sector construction firms and investors which enters into a long-term contract with a regional public agency to finance, operate, maintain and deliver strategic investments in transportation infrastructure. In 2004, Denver region voters approved a sales tax increase to fund the Denver Regional Transportation District (RTD)’s $4.7 billion FasTracks programme, a 122-mile extension of light and commuter rail along six corridors. Faced with a shortfall in regional funding, the Denver RTD subsequently entered into a contract with a GIP3 consortium to finance and deliver the Eagle P3 project, a major extension of the FasTracks system to Denver International Airport. The paper argues that future research on GIP3 contractual agreements needs to consider the local control of infrastructure assets and the integrity of supporting regional collaborative governance arrangements.