Last week I travelled from SC to Pune by this train (yes of course it was a last minute choice). The food was pathetic; instead of roti and rice they provided Veg biryani without any side dishes (No matter what you opted while booking ticket, they will provide only Veg). Strongly I can say if we eat that biryani definitely we will get stomach upset and etc.(why because it was off boiled and bad smell).
So I would suggest please carry food with you while traveling in this dirty old racks train.