The Al Mashaaer Al Mugaddassah Metro line, ( qtar al mashaaer al muqaddassah al khat diljanubi) is a metro line in the city of Mecca, Saudi Arabia. Claimed to have the highest capacity of any metro in the world, it operates for 7 days a week, and is used as an exclusive shuttle train for pilgrims between holy sites in Mecca, Mount Arafat, Muzdalifah and Mina to reduce congestion caused by thousands of buses and cars during the Hajj. It is the second metro system on the Arabian Peninsula, after the Dubai Metro.