Bhrigu Express: बलिया की आन बान और शान , भृगु एक्सप्रेस है तुम्हारा नाम। हर रविवार तुमसे मिलना है मेरा काम। - Shanzil Kabir

That's my point, All the Longer trains covering larger areas are on top courtesy of Berth Multiplexing. Purushottam has almost double revenue of Prayagraj Express considering almost 3x more distance covered. Nandan Kanan's lesser frequency gets written off by longer distance covered especially when you're below 491 km covering Lucknow Mail.

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