I really like the Rail line kits!
Sure, they have a bunch of miniature parts to be fitted, but the results are so worth it! 
I started on this D&RGW 3000 series boxcar the other night.

I painted it with Testor DRGW freight car red and then Microscale gloss before adding the San Juan decals.

It took a LOT of MicroSol to make the decals conform to the planking.

I used my own designed/printed trucks with Kadee wheelsets. They are very suitable for this car, as the couplers went on at perfect height with no shims.

I weather the car with oil paints that I dab on and then streak with a flat brush moistened with turpenoid.

When the oils have dried I add a brownish black oilbased filter all over before the detail weathering. I add some rust with Lifecolor acrylics and then some airbrushed dust.

Weathered and finished. 

The roof did turn out quite good.

It's always nice to have doors that can be opened. 
I use Sergent couplers on my fleet, and they sure look good.
Now I have 4 more to finish.