network's rolling stock. The current contract expired on 31 December 2019 with bids put forward by: Keolis in partnership with Transport for London and Eduardo Eurnekian's Corporación América Metrovías in partnership with Deutsche Bahn RATP Group Network and services 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 and serving 87 stations. There is also one surface 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 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. Annual ridership in 2019: 321 296 964.Annual ridership in 2020: 73 650 077. Fares and operating times Fares are AR$42 per trip on the Subte, regardless of travelled distance, though these can be as low as AR$18 depending on how many trips are made per month, while the Premetro has a flat rate of AR$15. Fares have been increased multiple times due to devaluation of the Argentine Peso. While tokens have been used in the past, at present riders use contactless cards called SUBE, which are rechargeable with multiple forms of payment. Previously, single or multi-use paper cards with a magnetic strip (called Subtepass) were used, however, these were phased out of the system in May 2016, opting instead only to use the digital cards, with the exception of some retired, disabled and student cards. Trains run from 05:00 until 23:00, every 3–4 minutes, for all lines except Line H which has a frequency of around 6 minutes. Under modernisation plans commenced in 2013, service frequencies increased to an average of one train every 2 minutes 20 seconds by 2019. Trains originally ran until 01:00 am, but following the privatisation of the service through concession to Metrovías, the company established an earlier closing time of 23:00 in 1994 to carry out works on the lines. This change was only meant to be temporary, but was never reverted even