Advanced Public Transport Systems, Aerobus International Inc, Aeromovel USA, Doppelmayr, GE MobileView, Global City Management, Ian Catling Consultancy, Intelligent Transport Systems International Magazi, Mikroelektronika, Paratransit Training and Consulting

Asia, Europe, North America, Oceania, South America, Kavanagh Transit

Cities, Chris's Transit Pics Website, Subway Navigator, The Subway Page, TubeMap.com, UrbanRail.Net