I spy....
Neat; "real" portholes. Those could liven up anything from cab to caboose on some tin, one offs, or fantasy styling. Maybe even look good on some of the more toyish AB diesels? (I'll detail anything, remaining scale is another story.
Some loads there if nothing else!
Oversized barrels? Then they're tanks now, make a fill top/vent & frame.
Mining, RR platform cranes, A-frame hoists etc. need Block & tackle parts/cleats. Some water/sand towers might have them too.
Crate full of pins load,or link&pin coupling extras..
Opposed pistons? or are those pumps? (still a nice load as steamboat parts, but I'm thinking makeshift vertical boiler platform engine or handcar mech. too.)
Same with the props, and vent horns, all nice loads. Small ones in crates, large fill a flat or gondola up.
Oar lock or a bell yolk? Could be on a building etc.
Collars are your tinkering buddies.
It doesn't have to be train stuff to be train modeling stuff 🙃