Copper & sulfur gondola 1:160 (N)
105-ton gondola for copper ore, model 22-466. USSR, 1967. Later these railcars with extended sides was also used for sulfur.
Parts marked "04" have walls thickness 0.4 mm, and "05" - 0.5 mm.
The same railcar in H0:
https://www.thingiverse.com/thing:4748506