Your details post has following point
1-No pantry car / catering service
2-Journey time
3-Passengers need to get down for meals
point 1 and 2 are already reflected in TT
point...
more... 3 seems to pertain to 'Halts' that enables passengers to avail 'meals at stations'. And when distance is 1636 kms, IR has provided nice halts of 5-8-10-25 min. halts for this idea that passengers deprived of pantry service/ catering service get 'satiating meals' at halts.
Though this things are hidden on TT page, nice to bring out on train tip section.