Agree... Great suggestion...
It is Macro analysis....
My opinion as Micro level these steps need to be taken in waar footing.
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more...
Infrastructure :
1) Double/Triple the Capacity : Priority basis Automatic Signaling for all HDN route or other route where capacity utilization is nearly or above 90-100% (including freight section)
Further All section need to upgrade ABS (Automatic Block Signaling )
2) Bypass Line need to construct each major station to bypass Freight traffic or Passenger.
Safety
1) 100% Fencing in entire network (Like 100%Electrification)
2) Kavach system will install priority basis where Dense FOG problem occurs and 130+KMPH section