The Dubai Metro (In Arabic: مترو دبي) is a driverless, fully automated metro network which is under construction in the United Arab Emirates city of Dubai. The Red and Green Lines are under construction, and further lines are planned. These first two lines will run underground in the city centre and on elevated viaducts elsewhere.[1] The Dubai Metro will be the longest fully automated rail system in the world when it opens in 2009.

http://en.wikipedia.org/wiki/Dubai_Metro