I also asked the pantry guy in dakshin exp while going to NGp from NZM ; managed by doon caterers( staff in green t-shirt). before itarasi I enquired that about 50 rs meal. They said "uske liye advance me order karna padta hai ... wo sasta khana hai ... bekar hai.. " and things like this.
Finally he said ab 1 baje to yehi mil sakta hai 120 rs me paneer thali. Then I went for meals sold by vendors in platform ( 60 rs plate)