JohnB: Actually, I assumed it was supposed to be a pumpkin, but have never seen a bright red pumpkin before. At least in the webcam, it looks much more like a tomato!
Also, thank you for the links, but I was looking more for information on the car itself. It's clearly NOT a D&RGW 3000-series boxcar, so what is it? Homemade on flatcar #6634? For revenue use, specifically as a rolling billboard, just an experiment, ???
Jeff: You might be able to find one at a craft shop, possible in the kitchen/dining decorations. It looks like plastic, so the cheapest one they have would probably be perfect.