I just returned home (literally, a few hours ago), from taking the US route of the Rocky Mountaineer, the Rockies to Red Rocks, eastbound from Moab to Denver.
I don't have the depth of knowledge about financial considerations and railroad operations as many of the others in this thread, and can't really speak on some of the issues above with any use.
That aside, it was an absolutely phenomenal experience.
I went with my mom, who is on the older side, and very seldom travels.
We flew into Moab (into CNY, Canyonlands Airport), after connecting through Denver. If you've been to Moab, you'll know there a number of hotels in town, and Rocky Mountaineer coordinates with two of them, the Hilton Hoodoo/Curio Collection, and the Hyatt Place. We elected to stay at the Hyatt Place, which, while not quite as top-tier luxury as the Hoodoo, was very nice on it's own, with a comfortable lobby, nice pool area, and very comprehensive continental breakfast.
The Rocky Mountaineer staff coordinate *everything*. On the day of departure, the train doesn't leave until about 1:30PM. That day, we booked a 3.5 hour bus tour of Arches Nat'l Park, alongside the RM booking. (The park bus tour was also exceptional). We left the hotel for the bus tour, and dropped our bags for storage with the front desk.
After our park tour, we were dropped off at the hotel (we chose to be dropped at the Hoodoo just to check it out). They had a large reception set in a banquet room, with cookies, drinks, staff to answer questions, etc. When it came time to depart two buses took us to a siding about 10 minutes outside of town.
After the first day of rail travel, before disembarking from the train, we were given our room keys, and we simply walked to our rooms to find the bags already there and waiting. The following morning, again, you simply walk out of the hotel, leaving your bags in the room, and they're picked up and delivered to your final destination by staff.
After the first day of travel, you'll arrive in Glenwood Springs, CO, where RM will put you up in one of two hotels. We were given two rooms in the Hotel Colorado, a historic hotel about a 5 minute walk from the Glenwood Springs station.
While we went into town for coffee in the morning, they set up a small reception at the train station with coffee, tea, and hot chocolate before boarding.
As for the rail trip itself, I honestly couldn't have asked for more.
The train was sparkling clean - the exterior, the seats, the restrooms, the bar, the windows, everything. And upon boarding the 2nd day, it had all been freshly cleaned overnight again.
The staff, again, was great. All smiles, happy to answer any question. Provided commentary and information throughout the route, but also allowed for periods of quiet to simply sit back and enjoy the views. Commentary topic was everything from geology and wildlife to rail and region history. Lots of information and history on the various tunnels you'll pass through.
The food was also great. We went in the "Silverleaf Plus", which I guess is the "First Class" for the RM routes in the US. (As mentioned above, they're single level cars, so dining is at your seat, which seems to be a notable differene from the Goldleaf offered on the Canadian Routes.)
You will be fed nonstop. I mean that. Multicourse breakfasts, lunches with desserts, constant snacks available at the lounge car bar. A beverage cart making constant passes. If I had one very minor quibble it might be that the meal menu was somewhat limited. I very much enjoyed it, but my mom, was is somewhat particular, occasionally wished for a few more options. For instance, on the first day, lunch choices were roast pork or a salmon salad as the only two options.
The seats are two by two, with sturdy tray talbes, electric outlets, and a wide aisle. Each car has a galley and two restrooms, and the "plus" cars have access to two lounge cars with player pianos, board games, and a staffed bar.
Our particular train ran pretty close to schedule, though they did mention that delays due to traffic will sometimes happen.
I've attached some photos below, but to be honest I was so busy with some of the best views I didn't even bother taking pictures.