| Title |
A Study on Communication-Failed Train Position Display in CBTC |
| Authors |
황욱진(Wook Jin Hwang) ; 강정원(Jeong Won Kang) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.4.899 |
| Keywords |
RF-CBTC; Train control system; Communication failure; Position display of train; Urban railways. |
| Abstract |
This study presents a system technology that uses trackside tags and onboard tag readers to display train positions independently of the existing train operation system, even in the event of communication failures. Its implementation was analyzed on an actual operating line. Furthermore, the features and functions of the implemented technology were compared with those of the existing operation system, to evaluate the reliability and potential limitations of the proposed approach. Areas for improvement identified during system operation were also discussed, and possible solutions were proposed. In some domestic railways, axle counters have been installed near switches to prevent position loss for trains affected by communication failures in CBTC systems. However, other operators have not adopted this measure due to the high costs of installation and maintenance. The proposed positioning system utilizes equipment already present in onboard and wayside signaling systems, thus offering the advantages of lower installation and maintenance costs and minimal interference with existing systems. It is expected that this system will enhance operational safety and minimize passenger inconvenience during severe communication failure scenarios. |