Well my latest rolling stock release has taken more time than usual since the cargo required way more work than the railroad car.
Before interstate highways and stackable containers, rail "intermodal" transportation was defined as driving transport trailers onto railroad flatcars to "piggy-back" their loads from city to city.
Railroads started by towing the trailers up long ramps onto a slightly modified standard flatcar and anchoring the trailers with chains. Soon modified flatcars were given integral fold down ramps so multiple trailers could be driven onto a long series of coupled cars.
Before trailers started to grow in length, they could fit one standard or two shorter trailers per typical flatcar. I justified the creation of two trailers since they could also be used to tow around my backlot once I get around to building the tractor truck.
Since trucks didn't have as much horsepower as today, trailers were much shorter. Fortunately short trailers are easier to model because they don't need side doors. But all that painted on signage meant that creating the decals took almost as long as the modeling.
To make the anchoring process faster and more secure, one flatcar manufacturer invented a retractable trailer hitch.
One man with a pneumatic wrench could lower or raise the hitch and lock the trailer in place.
This was one of the more difficult models I've tackled as there were very few reference photographs of them available on the net. And what was available were lo-res, isometric views. I basically had one good hi-res image that had a human close-by for dimensional reference but only showed about 75% of the hitch. So some of it is guess work. I may have over-compensated with the beat-up materials and dirt decals.
However, I think the old, dirty diamond pattern steel plating that I showed off a few weeks ago looks even better installed.