Daily service was cut during the 1950-53 Korean War.
The first regular train service in more than 50 years between the two sides began in December along a 20-km (12-mile) stretch that runs northwest of Seoul and heads to a factory park just north of heavily armed border where South Korean firms use cheap North Korean labor to make goods.
The train carried freight only 14 times in 163 daily runs from December 11 last year to late August this year, according to the South's Unification Ministry.
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