I think you need to check once again
• 12644 Dep from NZM was 5:50am & arrival at TVC was 11:35am. Running time almost 54 hours
• 06168: Dep from NZM 5:10am & arrival at TVC 7:05 am. Running time 50 hours.
Now...
more... you can figure out whether the train is speeded up or not !!!