In watching the Ft. Madsion BNSF webcam there is a lesat one daily WB intermodal UPRR train going by the webcam. On the rear end of the train in its consist are flatcars with a pyramid like object covered by tarps. Does anyone know what the objects are under the tarps as I have seen these trains in Colton & those cars are no longer part of the consist meaning they were cut from the train east of Colton? .