Attaching Pantry car is totally based on requirements specially in case of Short distance trains.
TataNagar is a TATA Major and one of those biggest Hi-Profile business area; hence the requirement of 1A and Pantry car is highly justified in this train.
Obviously it doesn't mean that long distance trains which doesn't have PC doesn't require it.It is based on the operation of the train along with the stations having (Smaller or Bigger)base-Kitchens nad availability of Vendors willing to operate in the sectors.
Like...
more... 2664/2666 TPJ/CAPE-HWH didn't have PC at the start. It's now augmented with PC after running almost 5 yrs without PC.