PASSENGER TRAIN EQUIPMENT - All Aboard: The Complete North American Train Travel Guide - page 150

If you have to sleep sitting up, this is definitely the way to do it.
Assuming you're not assigned to a specific seat, pick one close to
the middle of the car where the ride will be quieter and a little
smoother. Don't choose a seat in the last row, because they're in
front of a wall and won't recline as far. And, because they face
a wall, avoid seats in the first row, too. Not a big deal, but they
have just a bit less legroom.
Superliner Sleepers
If it's full to capacity, a Superliner sleeping car will handle as many
as 44 people in four distinct types of accommodations. As do the
coaches, these sleeping cars have a large luggage rack located on
the lower level of the car where you enter. This is where you should
store most of your luggage—everything but the personal items
you'll be using in your compartment. You will have access to your
luggage at any time during the trip, but it's just a lot easier to sepa-
rate out the necessities and take only those into your room. Don't
worry about leaving your bags on the storage rack; problems with
thievery are quite uncommon. Just be sure your luggage is locked
and clearly and securely tagged with your name and address.
There are fourteen roomettes in each Superliner sleeping car:
four on the lower level and ten on the upper. They are small but
very comfortable for one person, though they are designed to
accommodate two. Facing seats slide together and flatten out to
form the lower berth, and the second bed folds down from the
wall above the window. Since the upper berth is just 24 inches
wide (by comparison, a standard twin bed is 38 inches) and
rather close to the ceiling, I don't recommend it for large pas-
sengers. There are no toilets or washing facilities in the room,
so you'll have to use one of the four lavatories in the car—one
on the upper level and three on the lower level. There is also a
shower with a changing room on the lower level.