I was going to put this in the Bashing list, but this is peculiar to N scale. Dick Billings of Fine N Scale came up with this idea. For a machinery open load, go to the O scale lost wax castings/brass steam details section. Take one of those huge cylinder/air pushing parts, paint it and set it up with wood cribbing. Then tie it down to a flat car or one of those beat up gondolas. Sorry I don't have a better picture. When someone asks you, "What is that load," you can tell them that you have no idea! The load is in the gondola on the right. The gondola on the left has an I beam load.