Tomorrow’s weekly USDA Export Sales Report is an important measure of the pace of disappearance for U.S. grains, but another is the volume being loaded onto rail cars. This is true for both domestic consumption but also shipments out of the Pacific Northwest. Feed grain loadings were noticeably down during the summer of 2020 relative to the two prior years. However, they have taken an upshot in September that is in contrast with the recent past.  The fundamental question is whether these loadings continue at an above usual pace. If so, it could signal a catch-up in supply destruction bringing it closer in line with prior calendar years. If it flattens as it has in prior years, it could mean a buildup in surplus stock levels.&nbs...