Yes sir.MUMBAI to Nagercoil 4 days a week via Krishnarajapuram arrives Madurai in time at 20.55 or just 5 to 10 minutes earlier .It has to arrive at Kovilpatti at 23.05 .
But in all days delayed arrival more than 2 hours ( next day around 01.00 am ) 4 .00 hours travel time of this express due to more than 10 nos of daily express crossings in this section.
Normally express time takes 1.35 hours to 2.00 hours.
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more... So the critical section of MADURAI-VIRUDHUNAGAR-KOVILPATTI have to be taken up for doubling immediately.