# Double-Track One-Direction Operation Mode for Overnight Trains on High-Speed Railway
## 5 Discussion and Conclusions  
In this paper, we put forward the groundbreaking double-track one-direction high-speed railway operation mode by making full use of the high-speed railway reverse running ability and realizing the trains run in one direction through double tracks of the railway at night. It is a new idea for correlative research in how to improve the nighttime capacity of  
Figure 12: Half-operation diagram. high-speed railways. The mode was established as a mathematical model, and a relatively good result was obtained through the algorithm. The cost is relatively small compared to existing methods, and it is relatively easy to further popularize. Through the analysis of the existing research results, the relevant research has not put forward a very feasible scheme in the aspect of high-speed railway overnight running. Existing research mostly focused on how to shorten nighttime construction times or how to let trains circumvent nighttime construction. They have not tapped into the spare capacity of the high-speed rail itself. Compared to previous methods, our method can make full use of line resources and does not interfere with the operation of other lines, and no additional costs are incurred by and large. It can improve the economic benefits of railway transportation; thus, it has strong theoretical and practical implications. Under the premise that the maintenance disruption is no less than 180 min and the running time of daytime trains is not occupied, ten pairs of 250 km/h sunset-departure and sunrise-arrival trains would be operated on the section from Xuzhoudong to Xi'anbei of the Xuzhoudong high-speed railway, and another six freight trains from Xuzhoudong to Zhengzhou and six from Xi'anbei to Zhengzhou can also be provided. It can effectively utilize the operation capacity of the high-speed railway if the fully operational diagram can be used. About 12,000 beds or seats are being added daily, and high-speed freight of 1440 tons can also be provided. If it can be widely promoted, it can effectively improve the overall capacity of high-speed railway. However, the method in this paper also has some limitations. It does not comply with the relevant management regulations at present and cannot be put into use immediately. However, regulations can change with the development of technology. As the technology develops, train control systems that do not rely on track circuits will also be put into use, and the new pattern will be easier to use. Furthermore, when the trains that are running normally are delayed to the double-track one-direction period, the train cannot run in the opposite direction, which is bound to interfere with the night running; thus, an emergency plan needs to be formulated. Some research directions are worth researching continuously in the future. Firstly, the rendezvous stations are not necessarily close to the center of most lines, and how to coordinate the departure time of trains on both sides needs further discussion. It can be combined with the single-track railway operation mode to continue the research. Secondly, because our method can operate a large number of sleeper trains, the number of sleeper EMU trains is bound to increase substantially; thus, how these trains can be fully utilized during the day is worth studying. It is interesting to study whether the lunch and siesta train can be run between some neighboring big cities, which could be a good choice for some business people. In addition, relevant detection equipment can also be installed for some sleeper trains to replace detection trains. Next, how to organize cross-line trains on different lines and train network operations is the key to popularizing this method on a large scale. The other thing is that the calculation parameters of the entire line now are the same. In future work, research can be carried out in many aspects.