1. Punctuality - It can reach Amritsar slightly late by 1 Hour or a max of 1 Hour & 30 Mins since #EDFC Works are going on between Sasaram & Mughalsarai - EDFC Monitoring of Progress using Drone
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2. Cleanliness & Hygiene - The train gets cleaned right at Mughalsarai after departing from Kolkata Terminal since Dhanbad, Parasnath & Gaya aren't long duration stoppages
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3....
more... Food Quality - The train has no Pantry so 12357 will load dinner from Asansol & then right at Mughalsarai. The train loads breakfast the next morning at Moradabad but it may reach late by an hour. Hence, you better carry home cooked food with snacks items like biscuits, chips, namkeen mixture, etc.
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4. Rail Fanning - It's a fantastic train for Rail Fanning since it skips many stoppages & overtakes many other trains en route (9.9/10)
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My Trip Report regarding personal travel experience on 12357 Express .... :)