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From my experience on 12685/12686 jerk i have noticed during CBC Rake days, in LHB jerks have been far less. Ride comfort in AC is smoother and silent, while in SL initially days sound was a little disturbing. One thing surely missing in LHB was the side-wise oscillation. Quality of interior, is much better, but then it depends on whether you are allocated a fresh rake or used second hand rake as is the case with 12685/12686 where there is lot of plumbing issues and issues with windows etc with lot of jugaad fixes.

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Is 12685 having a full CC of SR coaches?

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yes yes. compared to CBC rake, jerk is very less. But not that much smooth as conventional rake..

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Need to verify the current rakes (i believe some of the coaches from Pandyan/Cholan/Rockfort had been swapped into the rakes these days - observation based on return to MDU markings), when it was originally converted, it did have coaches from other zone as part of the rake, especially it had a lot of second hand one's 2-3 years old (Even had advertising in Hindi for restaurants and clinics from north).

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Saw some NR SL LHB coaches in 12269/70.

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