Heavy freight traffic on that route. This is prevalent from last one year. The most affected trains are the one which comes from jabalpur side and goes towards Bilaspur. They have to criss cross whole up and down lines while going from Katni South to new katni junction on bilaspur line and same applies for vice versa. I have myself experienced this when i was onboard amarkantak express. It was halted at new katni junction for almost one hour whole freights overtook us.