The second car I detailed in the Lionel 2227350 CSX Business Train was the Sleeper, "Michael J. Ward". Like the NYC Southwestern Limited "Cascade Elf" Sleeper, it too is missing seats in the center Staterooms and two smaller rooms.
I ordered NYC Empire State Express coach interiors from Lionel Parts Department many years ago and cut out seats to glue into those center Staterooms.
I added Preiser 65602 Unpainted Seated People to the car in logical groupings.
Have a good evening.
Sincerely, John Rowlen