Much older is the august Madrasa-e-Khan, or Khan Theological School, with about 600 students; its tile-covered buildings date from 1627. Today Shiraz University is the largest university in the province, and one of Iran's best academic centers. Other major universities in or nearby Shiraz are the Islamic Azad University of Shiraz, Shiraz University of Technology, and Shiraz University of Applied Science and Technology. The Shiraz Regional Library of Science and Technology is the largest provincial library serving the public. Virtual University of Shiraz is one of the sub colleges of Shiraz University. Shiraz International Airport serves as the largest airport in the southern region of Iran. After undergoing renovation and redevelopment work in 2005, Shiraz Airport was identified as the second-most-reliable and -modern airport in Iran (after Imam Khomeini International Airport of Tehran) in terms of flight safety including electronic and navigation control systems of its flight tower. A metro system started in Shiraz in 2001 by the Shiraz Urban Railway Organization which contains six lines. The length of the first Line are , the length of the second line will be The length of the third line will be . 21 stations were built in route one. The first three lines, when completed, will have 32 stations below ground, six above, and one special station connected to the railway station. The first line was started in October 2014 between [[Shahid Dastgheib (airport) Metro Station and [[Ehsan Metro Station (Shiraz)|Ehsan]] stations. A single ticket costs 10000 rials, with trains operating every 15 minutes. Line 1 is extended from the airport To Ehsan Square (northern part). Shiraz has 71 bus lines. Iran's third Bus Rapid Transit opened in Shiraz in 2009 with two lines, and a further two planned to open in 2010. Service is free on 5 May, the day of the city. [[File:Shiraz Train Station.jpg|thumb|Shiraz Train Station]] Shiraz is connected with the rest of [[Islamic Republic of Iran Railways|Iran's railway network]]. The trains arrive and leave from [[Shiraz railway station]], Iran's largest railway station according to surface area. It has passenger trains, operating six days per week to [[Isfahan]], [[Tehran]] and [[Mashad]]. There are 700 000 cars in the city of Shiraz. There is a tourist information on the main boulevard.