If the 13351 is speeded up, it can probably reach Chennai at abt 10:30-11:00 pm. Though the time appears to be odd it is not that much different from the current arrival at 2:45 am. That time in fact would be a great advantage as it can serve as an overnight train towards coimbatore,kerala and serve as an additional option.In the return direction, there are lots of passengers who are preferring a day option between palakkad-chennai and if this train is speeded up it would be a great boon.Since only 30 minutes is required in Chennai, it is surprising why a slot cannot be provided considering trains originating and terminating at chennai take almost 1 hour from the time they are shunted till the time they depart.