Here is what I posted a while back about a viewliner I sleeping car roomette. I am still not sure about the viewliner II dimensions but it seems to me that someone has said they are the same but corrections would be welcome:
Here is what I posted then:
"The overhead storage bin in a Viewliner roomette is 21 inches deep, 16 inches tall and 35 and half inches wide so you can measure your luggage and compare the measurements to this space. There is a raised rim at the opening which is one or two inches tall and there is a railing at the opening to hold the luggage in place.
Note that in order to place luggage into the storage bin, the luggage has to clear a protruding light fixture and the railing mentioned above and this clearance is a little over 12 inches. So although the storage bin is 16 inches tall, a suitcase with rigid sides much over 12 inches thick would not fit into the bin because you wouldn't be able to get it through the opening."
Has anyone taken a tape measure on a trip on a Viewliner II sleeper and can confirm whether those dimensions are the same as on a Viewliner I or if they have changed? I intend to do so on my next trip but that may not be for a while."
The Viewliner roomette has a place next to one of the seats that's designed for hanging clothes, but I can balance a pretty decent size suitcase on the ledge and hold it in place with the provided strap. This does interfere a bit with the seat that's next to the suitcase, but when I'm traveling solo, it really doesn't matter, I just use the other seat. When I travel solo in a Viewliner, I use the upper bunk, so it definitely doesn't matter. My backpack either sits on the unoccupied seat, or I put in on top of the toilet/steps and move it to the unoccupied seat when I need to use the space. This configuration is similar on the Superliner II, but the Superliner I has a (worthless) closet that makes it impossible to store a decent size suitcase in the roomette. Fortunately, Superliners have a reasonably large luggage rack on the lower level, so that's where the Suitcase goes. (Even on the Superliner II, I am starting to have trouble hauling a big suitcase up the spiral stairs, and I just use the lower level luggage rack. )
If 2 people are traveling in a Viewliner roomette, this doesn't work, so you have to use the overhead storage cubby the extends out over the ceiling of the hallway. I have only done this once, and we had the sleeping car attendant hoist the bag into place and retrieve it.
With these facilities and my luggage limited to a rollerbag and a backpack, I have ridden many Amtrak long-distance trains without needing to rely on checking baggage. The only time I've checked baggage is for a couple of western ski and snowshoe trips I took, where I checked my skis and a gear duffle with snowshoes, boots, and other assorted bulky winter gear.