International Metro Service is a joint venture between ATM (Azienda Transporti Milanesi) and AnsaldoSTS. ATM is Europe's ninth largest public transport operator and is responsible for public transport in Milan. ATM has over 8,000 employees and over 600 million passengers a year in Italy. Ansaldo STS is a leading technology company operating in the global Railway & Mass Transit Transportation Systems business with the provision of traffic management, planning, train control and signalling systems and services. Saudi bin Laden Group (SGB) contracted with Ansaldo to construct and operate the Metro project in Princess Noura University (PNU) in Riyadh, Saudi Arabia.