I posted this in a TB railfan topic late last week. (I caught this in British Columbia, over forty years ago.) Directly behind the second engine. Nobody seems to know for what use this car was intended. It is not the typical one we have seen for helium. But sure looks like some sort of compressed gas cylinders. If it is simply pipe, I have never seen any load bolted in such as this example. I have doubts it has been modeled in any scale. Can someone identify it?