list of stations: Danxialu, Caohouxun, Nanjing Railway Station, Zhongyangmen, Chenghecun, Daqiaonanlu, Xiaguan, Agricultural Trade Centre, Dinghuaimendajie, Longjiang, Guanziqiao, Hanzhongmendajie, Shuiximendajie, Qinghelu, Lüboyuan and Binjianggongyuan. In the southern extension of Phase 2, Line 9 is expected to be extended all the way to Banqiao in the far south west of Nanjing. Line S4 Line S4 or the Nanjing-Chuzhou Intercity Railway is a connecting suburban Nanjing with neighboring Lai'an and Chuzhou of Anhui. The line will feature passing loops at select stations to allow for distinct express and local services. The line is planned to open by 2022. The line is planned to connect with the Chuzhou Metro. Ticket system Fares on the Nanjing Subway are distance-based. Fares range from 2 yuan (approx US$0.30) for journeys under 8 stations, to 4 yuan for longer journeys. There is a 5% discount for users of the Nanjing Public Utility IC Card. Fares can also be paid using Alipay. Single tickets Single journey tickets can be purchased from the ticket vending machine or at a ticket window. The ticket vending machine accepts both coins and bills (¥5 and ¥10). Transit card Apart from one-way tickets, fares can be paid with the Nanjing Public Utility IC Card, or Jinlingtong (). It can be purchased for a refundable fee of 25 yuan (about 3.8 dollars) and refilled at ticket booths inside the metro stations as well as many collaborative convenience stores throughout the city. The card can be used to pay for other means of public transportation, such as the city taxi and the city bus. This transit card is similar to Beijing's Yikatong, and the Octopus card of Hong Kong's MTR. Rolling stock 20 six-car Alstom/Nanjing Puzhen Rolling Stock Works Metropolis sets - ordered in 2002 for Line 1 opening. 21 six-car Alstom/Nanjing Puzhen Rolling Stock Works Metropolis ordered January 2008 for Line 1 extension. 24 six-car Alstom/Nanjing Puzhen Rolling Stock Works Metropolis cars ordered 2007 for Line 2. 26 four-car Alstom/Nanjing Puzhen Rolling Stock Works Metropolis cars ordered 2013 for Line S8. 29 six-car Alstom/Nanjing Puzhen Rolling Stock Works Metropolis cars ordered 2013 for Line 4. Signalling system For Line 1, Siemens Transportation Systems (TS) was awarded the supply contract in November 2002. For Line 2, Siemens Transportation Systems (TS) and its local partner Nanjing Research Institute of Electronic Technology (NRIET) have been awarded to supply the signaling system after signing a contract (about 25