![Commuters wait for a train at Sinseoldong Station in Seoul on Thursday, when service delays affected the entire Ui-Sinseol light rail line. [Yonhap]](https://wimg.heraldcorp.com/news/cms/2026/11/05/news-p.v1.20261105.7ead7b0d302e4bf18fa42b3687d3697c_P1.jpg)
A service disruption on the Ui-Sinseol light rail line that began around 6 a.m. Thursday was resolved at approximately 10:15 a.m., about four hours and 15 minutes after it started.
The delays stemmed from a malfunction in the electronic interlocking system as trains were being dispatched from the depot, widening service intervals across the entire line, according to Yonhap.
The disruption forced many morning commuters to seek alternative transportation.
The operator later sent a safety alert stating that all signal system faults had been resolved and that trains were running normally across the full line.
The operator said it is conducting a detailed investigation into the cause of the malfunction.
husn7@heraldcorp.com
