Been a while since I shared an update. The GS-4 is progressing nicely, I put it at a little over halfway complete. I have started the rough outline of the tender mesh as well, but it is not far enough to bother with pictures yet.
In the meantime, I whipped up a new tank car- Union Pacific class O-50-6, a 12,500 gallon single dome tank car built in 1937. Still needs new trucks, UV unwrapped and textured, but the mesh otherwise is complete. There will be quite a few road names applied to this tanker.
I've also been working with some other TF members to add a more "lived in" look to the tank car as well as future projects. This includes warping the handrails, running board droop, coupler droop, and few other things like bent grab irons and steps. You can see the effects of this in this view: