Having just picked up an old MainLine assembled kit for a 36', steel underframe car, I wonder if anyone can point me toward any photographic views of the prototype SLRX (assuming there was one with those features).
Justin, I have many photos of 36' Swift reefers with steel underframes, which came in a number of different versions. Let me know what era you model and I'll send you some scans of cars with appropriate P/L schemes.