Sorry for the lack of updates to this thread, I've been working on my HO layout so I've not had the time to post my latest work on my O scale projects.
I've progressed the 50' boxcar some more; fitting the door runners, adding definition to the roof and starting work on the ladders. I've also developed the underframe, though that's not yet finished - it needs air tanks and other details.
What I have done is start working on some pallets and oil drums to add to the inside to simulate a load. A lot more work to do there too.
Finally, I started work on a Quality Craft Models kit of a bulkhead flat car. Having never built a freight car kit before, I'm really impressed with these wooden craftsman kits, and I'm enjoying the build so far.
More to come as work progresses. 
