When I first saw the new bracket parts found in the LEGO Tipper Truck #4434, I realized I needed to use them to make a train car.
I used parts from 2 of those sets to make this, along with a few parts I had laying about from other sets I’d recently taken apart (mostly the Maersk Train 10219). It was a very simple build – the main part is just two of the tipper parts from the Tipper Truck set with just a few tiles rearranged. The undercarriage is just made of plain grey plates, and the wheel trucks are quite simple.
In 2008, I designed another Gondola car, using 1x2x2 panels with 1×1 bricks between for the sides. This was so much simpler, and arguably more realistic (thinner walls), though the older model has more details on the ends. Instructions for that older model are available, but the new part isn’t in LDraw yet so I can’t make them for this one for a while.