The Dubai Metro is the longest fully automated rail system in the world. Currently, rail has only 26 stations of the red line, whose length is 52.1km(about 30miles).The opening ceremony for Dubai’s Metro was held on 09.09.2009 at 09:09. The first two days after the discovery of this giant rail, it served more than 110,000 people, representing 10% of its population. Subway is very popular for tourists, because with this rail, you can see the entire city. One train of five wagons, can accommodate about 643 people.The maximum train speed is 110 km/h(about 70mph). Construction of subway cost $ 7.8 billion dollars.