AC 2 has 2 layers ( floors ) of seat ( beds ) and AC 3 has 3 layers ( floors) of seats ( beds ), AC 2 is better than AC 3 if you need more privacy otherwise both are fine . AC 2 cost more than AC 3 if compared cost wise.
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The 3AC is 3tier, 2AC is 2tier berths and 1ac is having more privacy and the attendant will make bed for you. AC is same , the only difference is seat/berth numbers. 1 AC - 1 seat/berth ( lower berth) , 2 AC - 2 seat - Bunker bed type - lower and upper berth, 3rd AC - sleeper berth ( lower, middle, upper).
• Tier 1 – Partners that you directly conduct business with. • Tier 2 – Where your Tier 1 suppliers get their materials. • Tier 3 – One step further removed from a final product and typically work in raw materials.
Exclusive to First-Class PassengersOnce onboard, you'll enjoy complimentary at-seat meal and beverage service provided by our onboard staff of First Class attendants. Selections include freshly prepared chef inspired entrees as well as alcoholic and non-alcoholic beverages.
Upgradation of passengers is done to one class above only e.g. from sleeper to 3AC, 3AC to 2AC and 2AC to 1AC, said IRCTC. 4. The original PNR of upgraded passengers remains unchanged and all information from PRS is provided when an enquiry is made with the original PNR. 5.
AC three tier: Air-conditioned coaches with 64 sleeping berths. Berths are similar to 2A, but with three tiers across the width and two lengthwise for eight bays of eight. They are slightly less well-appointed, usually with no reading lights or curtains.
The food fare is included in the main fare. Nowadays, an option is available to passengers, to opt out of Rajdhani food and if done, the cost of ticket reduces. On any other train, in AC 3 Tier, you can order food and pay for it. So this is not a facility really - just a convenience.