Here are two pictures that I took today of the interior of railroad dining car kitchens from the 1940s.
The above picture is of the kitchen from the Burlington's
Silver Hours, built in 1940 and used from 1945 on as the tail car of the
Sam Houston Zephyr. It had this kitchen, a dining section with 24 seats at six tables, and a parlor-observation section with 22 swivel seats.
This photo is of the kitchen of Southern Railway dining car #3305, built by Budd in 1949. It is much larger than
Silver Hours' kitchen as this car seated 44 patrons. The foreground area contains the pantry and scullery where dishes were stored and washed and where cold meal items were prepared; obscured by the cooler and the tub of dishes is the kitchen proper where the chef worked on the stove and grill.
This is a look at the diner seating area for Southern 3305, seating 44 passengers at 11 tables of 4. Two of those tables are behind the glass partitions visible at the rear of the seating area; I believe that these were used for colored passengers during the segregated era.
Edit To Add: My thanks to the
Galveston Railroad Museum....