I think those cars are actually not for Sipi, but for General Iron or Finkle. From the Metra, you can see they are on the lead next to Sipi, not on the sput into it. My understanding is the UP puts them there for the CTRR or vice versa. Those particular cars have been there since at least last Monday. I\'ve been riding the Metra past this for about four months and unfortunately have yet to see any cars on the Sipi spur inside their fence.