प्रयागराज एक्सप्रेस - जो भी हो तुम खुदा की कसम; लाजवाब हो

Sir,
Super fast train numbers always (If some rare exceptions are there, I am unaware of at this time) start with the digit ‘2’. All Rajdhani, Shatabdi, Duronto, Garib rath, Janshatabdi, Yuva trains too are (necessarily) Superfast and hence, the numbers of these trains begin with ‘2’.

---