Each line of Beijing Metro belongs to two operating companies, one is Beijing Metro Operation Co., Ltd. and the other is Jinggang Metro Co., Ltd. The second question involves the content of ticketing sorting system. There are two modes of operation of Beijing rail transit network: one is one-vote transfer, in which passengers arrive at the destination station with one vote without having to swipe their cards repeatedly when passing through the lines operated by different operators. For example, from 1 line to Line 2, transfer to Line 4, that is, one ticket passes through the stations under the jurisdiction of Beijing Metro Operation Company and Jinggang Metro Company, and there is no need to pay by credit card again. The other is paid transfer, for example, the airport line needs to be re-swiped to pay, and there is no ticket purchase problem in this journey. There are many factors involved in ticket sorting, such as construction cost, number of stations, line mileage, number of transfer stations, transfer mode, train interval, service time and ticket policy. According to the contribution of different lines, the sorting ratio is determined. Generally, an applicable sorting method is determined first: the shortest path principle: the shortest distance of passengers from the starting point to the end point is used to determine the path. That is, the contribution of passengers is clearly distributed to the starting station, terminal station, transfer station and line that this line passes through. This is the sorting method adopted by most subways at present. For example, Shanghai adopts the shortest path method. The shortest time principle: determine the bus route that passengers spend the shortest time. Principle of least number of transfers: determine the ride path with the least number of transfers. The principle of using the least fare is: because China currently implements the one-vote system, it is not widely used at present. Guangzhou adopts the generalized shortest path method to distinguish different situations and make a simple approximation. After defining the sorting method, for example, the shortest path method is adopted, and then the sorting weight of each routing station is determined one by one. There are many ways to set the weight, such as distance method, station number method, zoning method and so on. To make the sorting system work, AFC (Automatic Ticket Checking System) is needed to organize the data of swiping cards into an "effective path table". With the input of effective path data, according to the pre-designed "sorting proportion table", the "sorting income sub-account table" is finally formed. So as to realize settlement between different business entities. AFC system includes several levels: central computer (ACC), line central computer (LCC), station computer (SC) and terminal equipment (TU). TU includes: automatic ticket vending machine, automatic recharge machine and automatic ticket checking machine. : SC and TU are located in the stations of urban rail transit, LCC is located in the operating companies of various lines, and ACC is generally located in the comprehensive dispatching control center or special ticketing clearing center of the whole network. LCC, SC and TU belong to operators' own facilities and equipment, which are put into operation at the same time as the line is completed and put into operation; ACC is a top-level system for ticket clearing under the network operation environment, and it is a clearing party independent of all operating companies. 1. Study on One-vote Pass in Urban Rail Transit.