3tier AC or 3tier sleeper and whether it is 3tier AC and 1AC? Please clarify so that we can answer properly. Good wishes.
If it is comparison with 3AC and 1AC, the difference is that in 3T AC there are 64 passengers, and no doors in between the bays, except curtains (in some trains), and in 1AC there are only about 24-30 passengers, and they are accommodated in Cabins, which can be locked from inside. Next 3TAC does not have shower facility, 1AC has facility for shower with soaps, etc provided. There is also a calling bell inside 1AC cabins for calling the coach attendant whose duty is to help you get water, tea, etc. Does that answer your question?...
more... Let us know. Good wishes.