3.2. Simulation Results and Analysis Figure 2 shows the analog space-time diagram when the passenger/freight ratio is 4:1, in which the abscissa represents time, due to the

large amount of output data, so 1s in the figure represents the actual 5s; the ordinate represents space. The horizontal lines in the figure indicate PLK1 kinase assay the stations; lines with small slope are the running lines of freight trains and lines with larger slope are the running lines of passenger trains. Figure 2 The operating condition of four-aspect colour light system. Figure 3 shows that a passenger train departing at time 0 from the departure station will directly go through the system because the line is train-free and is not in the maintenance period at this time. The third

and fourth trains issued from the departure station are freight and passenger trains, respectively. It can be seen from the figure that the freight train departed before the passenger train; after passing the second station, the passenger train has caught up with and is following the freight train; at the third station, the freight train stops, and the passenger train overtakes it; when the passenger train travels out of the third station and the safety condition is met, the freight train will start to move on. When the passenger train travels into the fifth station, the station is in the maintenance period and it cannot pass, so the train stops at the station waiting for the overhaul being completed; all subsequent trains will also have to wait in the station until the maintenance period is finished. When the maintenance is completed, the station will take the centralized departure principles (passenger trains first; first come, first go) to give off all the detained trains as soon as possible. From the time of 2100s when the maintenance is completed, the

station begins to let the trains depart following the principles, until all the trains Batimastat left. Figure 3 Operation diagram when the passenger/freight ratio is 4:1. Figure 4 is the operation diagram when the passenger/freight ratio is 1:1. It can be seen from Figure 4 that due to the fact that the third station is in maintenance period all trains in the station have to wait until the end of the maintenance, which makes the road section between the third and the fifth stations be idle; after the maintenance period, the third station will take the centralized departure, which will make the road section be busy and will enhance the running load.