I don't know about the National Park passes for sure, but I'm thinking that we do not.
One of the cars in our collection. This is a modified Kling type hot metal car, built by the William B. Pollock Co. in Youngstown, OH. It was capable of handling 75 tons of molten iron from the blast furnace to the open hearth plant on the other side of the Monongahela River.
Looking at the "high line" and the car dumper. The track on the left was for a self propelled transfer car that would move the iron ore from the ore bridge to the stockhouse bins. The center track was for iron ore that bypassed the ore yard, limestone, mill scale, sinter and whatever other raw materials were needed. The outside track was reserved for coke deliveries and was equipped with a car puller to spot hoppers over the coke bins.