Years ago, I bought some AMS flatcars.
They were relatively cheap at $36 each...about what I would pay for couplers and trucks alone.
Anyway, I never had any intention of using them as flat cars, but they sure make a great starting point for any car using a truss rod.
I had earlier used some other frames for my ventilated boxcars here.
A long time ago in a galaxy far away, Bob had given me a set of decals for his Nashoba Valley Transportation Company.
Finally, it's time to get another boxcar to run on my layout.