Pantry staff of any train run a loot business(except Raj/Duronto/Shatabdi). Once my father was travelling from HWH-GHY on 12345 and he ordered egg meal from PC. Once the caterer came to charge bill, he charged 160! Reason he gave was adding salad, sweet and other bogus things. Thankfully, the matter was solved and regular pay for egg meal was charged but that came after much trouble and arguments. That is why whenever I travel, I either get down at big stations and buy food from vendors or rely on e-catering.