A freight train was parked on the railway that ran along one side of the depot and continued directly to the gun complex. It consisted entirely of hopper cars loaded with sulfur. At the opposite end of the train from where Rufus was, a pile of sulfur—a smaller version of the one on the Houston waterfront—sat on the ground like a huge yellow traffic pylon. Near it, he knew, was a shallow pit under the railway where the hopper cars, one by one, discharged their loads. Empties then coasted under gravity power onto a siding where they could be reassembled into trains that would deadhead back to Houston.