2 trains has to cross the same route
76551 and 56515.
and few trains has to travel the same track
like 16590 ..
any delay in the journey, destiny...
more... arrival time keeping in mind . due to this Slack time will be give more near to the final destiny of th travel .
Similary NAnded - Bangalore Exp takes 2 hours to cover 18 Kms. slack time is kept near to the destiny of the travel.