What is the difference in seating arrangements between the coaches of trains in indian railway?

Question

for Sleeper, First Class, AC 2Tier, AC 3Tier, First AC / Second AC, First AC

Answer 1

As in India?...they hang all over the place. 88 passenger bus here is a 188 passenger bus there....lol.

Answer 2

How complicated!  Here in the USA Amtrak has two classes.

Sleeper - includes all meals

Coach - a seat only.  Meals are purchased "ala carte"

Some routes have a business class, which means a more comfortable seat, and free snacks and coffee.