ART poked me. I see it, I told it. The search had turned up a series of notices posted around the right timeframe. They were warnings that changes in shipments of raw materials and supplies to outlying installations would cause diversions in the passenger tube routes. (The tube was a small-scale transit system that took passengers around the port and service centers and had private lines going out to the closer mining installations.) Later notices mentioned a new route that had been constructed to compensate for the diversion.