A 77-year-old woman surnamed Park was killed and 92 are being treated for injuries at nearby hospitals.
According to state-run railroad operator KORAIL, an O-Train -- a sightseeing train -- appeared to have ignored a stop signal and crashed into a stationary Mugunghwa train.
"The driver of the O-Train seemed to have misread the signal or the signal may not have worked properly," said Lee Kwang-won, a transport ministry official in charge of railway control systems.
He added the ministry will conduct further investigation to determine the exact cause of the collision.
Transport Minister Suh Seoung-hwan left for the accident site late Tuesday.
(From news reports)