CN 6923 is actually the trailing unit of a CN grain train. A BNSF coal train ahead of them needed a shove, so they coupled up to the DPU and gave a helping hand.
A loaded ore train from the Minorca Mine near Virginia, Minn. to Escanabe, Mich. heads east on the CN's ex-WC main line south of Murry. The train is mde up of WC ballast hoppers.