It's Garys fault!

[sgtcarl1]

I feel quite certain that BNSF probably mixes some of the red cinder from Mt. Humphrey; which is the largest "volcano" in AZ. After all, I think Az was the birthplace of "cinder" block, so-called because of the red cinders used in place of gravel. Gravel, as we know it, is crushed granite. Az doesn't have any granite mountains to be turned in to quarries.