Bilkul sahi kaha...
130 hone par bhi Rajdhani OT karegi.... but problem ye hai ki same category, same travel time aur same class ki ek train dusre ko OT karti hai to ye sahi nahi hai..aur yahi karan hai delay ka.
Example - 22412 depart 15:50 and 12878 depart at 16:00 but always OT to 22412 while both are same class, same MPS, same journey time.