Technical feasibility analysis and introduction strategy of the virtually coupled train set concept

Sebastian Stickel,Marion Berbineau,Javier Goikoetxea,Moritz Schenker,Holger Dittus,Stefano Canesi,Francisco Parrilla Ayuso,Paul Unterhuber,Vincent Riquier

doi:10.1038/s41598-022-08215-y

Abstract

Today’s railway network capacity is limited by constraints imposed by traditional train protection systems. A way to overcome those limitations, maximize the railway network performance and also increase the operational flexibility is presented by the Virtually Coupled Train Set (VCTS) concept. This paper evaluates the technical feasibility of this approach, that was developed and is further evaluated in the framework of the Shift2Rail (S2R) project X2Rail-3. The main functionality of virtually coupled train sets is achieved by replacing the mechanical coupler between two railway vehicles by an electronic (virtual) coupling link. This operational change requires a permanent vehicle-to-vehicle communication and precise distance measurement, while enabling much faster coupling and decoupling procedures, increased interoperability and the operation of trains with a headway below absolute braking distance. To evaluate the technical feasibility of the VCTS concept, a series of technical and operational subsystem have been identified and analyzed. Interviews with experts from a variety of VCTS linked topics have been conducted, to evaluate the state of the art and new developments for those subsystems. Subsequently, the capabilities of the subsystems have been compared with the requirements of the VCTS system. In addition, different mitigations to overcome possible obstacles have been identified and evaluated. As the result, the most critical technical aspects for the implementation and success of VCTS have been identified as the requirement of controllable, fast and accurate responding braking systems, the availability of suitable communication technologies and frequency bands, the need for highly-accurate measurement of distance, speed and acceleration and the fast detection and monitoring of train integrity. Considering those results, a qualitative roadmap for the future VCTS development and introduction strategy is derived.

Highlights

Background and motivationWith an increasing demand in passenger and freight transportation, railway networks are approaching their capacity limit, especially in densely populated areas and on highly frequented lines
While the development and implementation of the European Train Control System (ETCS) Level 2 and ETCS Level 3 can present a substantial increase of railway capacity already, the Virtually Coupled Train Set (VCTS) paradigm goes beyond those concepts
This paper summarizes the analysis of the technical feasibility of the VCTS concept

Summary

Introduction

With an increasing demand in passenger and freight transportation, railway networks are approaching their capacity limit, especially in densely populated areas and on highly frequented lines. This leads to a lack of flexibility within the railway operation, resulting in delays and overcrowding for passengers or the lack of transportation capacities in the case of freight transportation. By establishing a continuous communication between the trains and utilizing a cooperative braking curve, those vehicles can be operated in relative braking distance, as opposed to absolute braking distance. This allows for an even lower separation between trains, further increasing track capacity

Methods

Findings

Discussion

Conclusion