HAJJ METRO TRAIN, Mina to Arafat Train, Al Mashaaer Al Mugaddassah Metro line, MASHAEER TRAIN 

Hajj Metro Train or Al Mashaaer Al Mugaddassah Metro line is a metro line in the city of Mecca, Saudi Arabia.
Claimed to have the highest capacity of any metro in the world,
it only operates for 7 days a year 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.
the line will replace 53,000 buses, promising a safer, more comfortable pilgrimage.[3] By the time of the 2011 Hajj (Hajj 1432), it was able to operate at 100% capacity and is estimated to have carried more than 3.95 million