Each line serves a distinct purpose within the wider network. The Red Line is the backbone route, running the full length between Saddar Rawalpindi and Pak Secretariat Islamabad along Murree Road. The Orange Line branches toward Islamabad International Airport, making it essential for air travellers. The Blue Line follows the Islamabad Expressway corridor out to Rawat, while the Green Line serves the Margalla foothills route up to Bhara Kahu.
Together, these four lines form an integrated network with shared interchange stations — meaning a single journey can often combine two lines without leaving the metro system. Below, each line is broken down in full detail with stations, journey times, and what to expect.