I loved the color scheme that the "Gwen" dining car had in the British Pullman, so here is my rendition.
The majority of seating is for 2, but I included two 4-seat tables, as well as two semi-private "coupe" compartments in the back. The restaurant serves meals from the menu or you can eat from the buffet. Since I read that each Pullman car had unique mosaic tiled bathrooms, I wanted to make space to include one regular bathroom (and also have two other all-in-ones). I carried that same flooring into the entrance areas on each end. I removed one side door as well to make room for that kitchen and bathroom.
Store item notes for @Jessabeans: As you know, I used wall covering from the "Boardwalk" venue and of course items from the "Business as Usual" venue. All the other items are individual store objects.
P.S. I'm waiting to upload my lots to when you release the next version of your world, in case the tracks sit differently. I'd like to have a good picture with the train on the rails. :)