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.