Vaigai வந்துருச்சு, ஆசையில் ஓடி வந்தேன்

you are right, 12649/50 is one of the most preferable train for many of the passengers. This should be given lhb first.

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yeah that's the right point to be noted.

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Of course TT is what matters, but the Coach still play a vital role. Lets take an example of 12649/50 itself. It is an ICF rake train, capable of running at a max speed of 110 kmph. Now, SC - KZJ section is capable of handling trains at 120 kmph, further north, BPL - NZM is capable of handling 130 kmph (BPL Shatabdi hits 150 kmph and Some RAJ's hit 130 kmph - 140 kmph), but due to rake capacity, KSK will not be crossing 110 kmph mark. So if this train was given LHB, it could run at at least 120 kmph, hence reducing travel time. 22685/86 is a slow train, hence 12649/50 deserved that LHB Rake!

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then more LHB rake will require for 12649 50 with 12629 30

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Yes, however 22685/86 will need 2 rakes. They should have made 3 rakes and should have been assigned to 12649/50. The existing 5 ICF rakes could have been shared between 12629/30 and 22685/86.

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