- Avoid Sleeper class. It's always crowded, and vendors keep streaming in and out.
- AC coaches are safer and they also have an attendant (though may be be difficult to get hold of most of the times).
- Second AC has two berths per side. There are curtains on all sides for privacy, but this may or may not pose some other problems.
- Third AC is ok, with no curtains and three berths per side. This is the one I prefer.
Avoid First AC like plague. Politicians and their goons use them (not exclusively, of course) and there have been incidents of molestation and rape.
No matter what class you book, avoid the side upper/lower berth. This exposes you to the people using the passage way. The creeps tends to feel you up/try to molest you at night.
======= | P | |S|
Row 1 | A | |i|
| S | |d|
Row 2 | S | |e|
======= | A |
| G |
| E |
| G |
| E |