A policy decision was taken sometime back to remove all pantry cars, and instead provide Pantry services on all trains in a phased manner. The pantry services of these trains contain hot cases, and facilities for making tea/coffee, and serving snacks, biscuits, water bottles etc.
Food and other eatables are picked up various points such as CBE, ED, KRR, TPJ, depending upon the timings .. you can make that out by looking at the time table. And you can observe it also.
PCs are being phased out in almost all trains, except Durontos,...
more... Rajdhanis/Shatabdis, because they have limited stops, and their timings also do not suit pick up from base stations.
Good wishes