Bilkul... Aur route pe bhi depend karna chahiye... Yaha howrah se to kuch fast passengers bhi 45 kmph ka avg speed dete hain. Wo sab route ke hisab se thik hoga lekin atleast ek minimum criteria to hona chahiye. For e.g. Howrah Ahmedabad Express ko bhi superfast bana rakha hai jo kisi angle se superfast nahi honi chahiye but route ke karan 55 kmph de deti hai.

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There is no hard and fast definition for an express train. Usually, if a train does not stop at all stations on the route, then it is called an express. If it stops at all, or almost all stations on the route, then it is called a passenger.
Earlier there used to be a category called 'fast passenger'. These were trains with less halts than a passenger, but more than an express. But again, there was no cutoff for the number of halts. Some zones would call a train as fast passenger, while other zones would call the same train as 'slow express'.

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cmnr-tpty stops at most of the stations enroute but it's still called as express :)

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Even once better than rajdhani Vaishali bhi non sf ho jaayegi

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This train Malgudi express is running on SWR. Nowhere it touches KR. Please change your post accordingly

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