 The network comprises six underground lines, labelled "A" to "E" and "H" and which are further identified by different colours, covering a total route length of 53.9 kilometers (33.5 mi) and serving 86 stations. There is also one surface 7.4-kilometer (4.6 mi) Premetro line with an additional 17 stations. Daily ridership was approximately 1.11 million in 2015. With the current usage patterns, the entire system is overstretched, and during weekdays overcrowded and with insufficient services. An expansion programme is underway, and it is expected to enlarge the network to 97 kilometers (60 mi) in the future. Similarly, new rolling stock has been incorporated across lines since 2013 to improve capacity and the last of the current orders are set to arrive in 2016 and followed by further orders of new rolling stock, which is expected to increase ridership figures to 1.8 million by 2019.
