There were several unique features to the Daylight fleet that I think there is still some merit in. These cars had a unique luggage loading situation where the porter could press a button and the shelf would move up or down to load bags from the ground. So you weren't having to lug the bags up and down the steep stairs. I think this was very unique and innovative. And I would love to have seen this in operation. However I think most of these cars were retrofitted in the 60s away from this. And I don't know of any like this that made it to preservation. Not saying one didn't, I don't know it all. But I'm confident in that synopsis.
The other unique item was more on the Cascade and the Shasta Daylight which was the tipple unit diner/lounge/kitchen/dorm car. I know of at least one of these that was preserved in Grapevine, Texas. It allowed for a full lounge, and full diner in a really elegant set up. Hopefully they get it restored. I'm sure parts will be a problem.