Seaboard ran "The Tidewater" between Portsmouth and Raleigh and it was a mix of lightweight and heavyweight cars:
Trains No. 17 and 18
Portsmouth to Raleigh – time approximately 4 hours 15 minutes
Power – E7 (3017-3048) 3029 – Mint Green (1965)
3041 – Mint Green (1965)
3030 – Mint Green (1966)
3030 – Citrus Scheme (1951)
3040 – Citrus Scheme (1951)
E8 (3049-3059) 3049 – Mint Green (1958)
3053 – Mint Green (1963)
1) RPO-Baggage Heavyweight, ACF
2) Dining Car Heavyweight (227, 240)
3) Coach Heavyweight or Lightweight (52-seat Budd) (6219)
4) Sleeper Lightweight (5-1-4-4) 5 Double Bedrooms, 1 Compartment,
4 Sections, 4 Roomettes
5) Sleeper Lightweight (5-1-4-4) Budd, 5 Double Bedrooms,
1 Compartment, 4 Sections, 4 Roomettes
6) Coach Heavyweight or Lightweight (52-seat Budd) (6219)
Train would proceed to Raleigh, leave Engine, RPO, and Diner at Raleigh. Attach Sleepers and Coaches to Southbound train (Silver Comet).
So I run a mix of LW and HW. Every now and then I'll throw in a "fantasy" car, my Seaboard Sun-Lounge car (sorry, no picture yet). I doubt the Sun-Lounge car ever made it to Portsmouth, unless it came in for repairs.