The nation's rail services are again feeling the strain on this fourth day of a walkout by members of the Railway Workers' Union.
Freight train services are the worst affected running at just 37 percent of normal levels.
Express train services have also been hit, but the nation's high-speed KTX bullet trains continue to operate as normal.
Around one-third of KORAIL's workers remain on strike but around 6-hundred have returned to their roles since the strike started Monday.
Out of the over 7-thousand 3-hundred workers that have gone on strike, the vast majority - over 67-hundred - have been removed from their posts.
The union launched the strike in protest of KORAIL's plan to establish an affiliate for a new KTX line.
It thinks the plan would eventually lead to the privatization of KORAIL, mass job losses and fare hikes.