This is a scale model of a coal hopper railroad car, where 1 stud's width on the model is equal to 15 scale inches. Using this scale, the car is 45 feet long, approximately 10 feet wide, and 13 feet high (from the bottom of the bays to the rim of the car.) At this scale, a minifig is almost exactly 6 feet tall, so I feel that I've managed to make a car I can confidently call "minifig scale." Now that it is nearly complete, I was unhappy with the strength of the bay doors, and have simplified them somewhat. I have also found that the ribbing on the sides did not hold square as hoped, and I'll be redesigning a bit by replacing the top row of bricks with longer technic bricks to hold the 1x4 tiles square. All told, I'm rather pleased with the design, and the brick-built trucks work suprisingly well. All that remains is to add greebles and brake cylinders on the one end, and following that, decals.