Positive Train Control with Headway Optimization on an Active Communication System-a case study of Addis Ababa Light Rail Transit

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Addis Ababa University


Reducing rail transit's headway effectively is of enormous practical value since it plays an increasingly significant part in the public transportation system. Some of the most important goals in railroad operations include safety, capacity, and timely schedules. The idea behind positive train control (PTC) is to use cutting-edge 2 information technologies to increase the safety and effectiveness of railroad operations. Except for increasing the average waiting time, headway irregularity may also result in additional energy consumption and more delay time. Active communications and other information technologies enable the deployment of a dynamic headway, which can increase track capacity and dispatching effectiveness while also enhancing safety. Minimum headway, which is the optima Interval time the following train can reach while tracking the lead train, is considered to be one of the main factors restricting operational capacity. We can run with better headways without increasing the operational speed; for example, the Addis Ababa LRT currently uses 15 minutes of headway when the speed is averaging 20-70 km/h. The calculated results show that this significant headway can be reduced by up to 4 minutes without slowing down operation As a result, dynamic headway control cannot be represented using existing modeling techniques that use fixed headways, especially when the dynamic headway only comprises a small portion of a single block. Minimum headway shall be a minimum period of time required for the station to carry out requisite train arrival and departure operations, which it is also essential that trains operating in this area are safe.



Delays, Positive train control, headway, headway irregularity, capacity and safety