Instead of start from poy by 6 am if it start by 5 AM it can return to POY by ~ 11:15 PM. I think if it crosses 12 mignight it cannot e called as intercity exp.
I would suggest instead of intercity and giving a additional train to cbe, the train shall be super fast exp via udt, plni, DG, TPJ to MS starting 7 am POY and 12:30 noon MS
07:00 AM - POY
07:30...
more... AM - UDT
08:15 AM - PLNI
09:20 AM - DG
10:45 AM - TPJ
04:00 PM - MS
08:00 AM - MS
02:00 PM - TPJ
03:30 PM - DG
04:40 PM - PLNI
05:30 PM - UDT
06:00 PM - POY