Mechanical failure eyed in Seoul train collision

May 04, 2014 - 1:20:16 am

SEOUL:  A malfunctioning automatic stopping system caused the recent collision of two subway trains in Seoul, officials said yesterday.

A moving train slammed into the rear of another, which had stopped at Sangwangsimni station in eastern Seoul on mid-afternoon Friday, leaving more than 200 people injured. 

The accident was a fresh blow to a country still reeling from the April 16 Sewol ferry tragedy that left 300 dead or missing -- most of them high school students -- after the ship capsized and sank.

“The Automatic Train Stop system (ATS) installed at Sangwangsimni station failed to function properly,” Seoul Metro President Chang Jung-Woo said.

ATS is designed to control the distance between trains, and should activate when the two trains were within 200 metres of each other. The system malfunctioned, consequently, the following train came too close to the stationary train, leaving little time for the driver to brake.

The tunnel curves before entering Sangwangsimni station and the driver did not see the platform was occupied until quite late, Chang added.

The last two carriages of the stationary train appeared to have been thrown off the rails by the force of the impact, and TV footage showed cracked windows on the two trains and one door connecting two carriages that had been completely knocked off its hinges.

Train service on the subway line No 2 returned to normal early yesterday.                AFP